American Journal of Botany 92(4): 584–602. 2005.
PHYLOGENETIC RELATIONSHIPS WITHIN THE TRIBE
MALVEAE (MALVACEAE, SUBFAMILY MALVOIDEAE) AS
INFERRED FROM ITS SEQUENCE DATA1
STEVEN
JENNIFER A. TATE,2,7 JAVIER FUERTES AGUILAR,3
J. WAGSTAFF,4 JOHN C. LA DUKE,5 TRACEY A. BODO SLOTTA,6
AND BERYL B. SIMPSON2
Section of Integrative Biology and Plant Resources Center, The University of Texas at Austin, Austin, Texas 78712 USA; 3Real
Jardı́n Botánico, CSIC, Plaza de Murillo, 2. 28014, Madrid, Spain; 4Allan Herbarium, Landcare Research, P.O. Box 69, Lincoln
8152, New Zealand; 5Department of Biology, The University of North Dakota, Grand Forks, North Dakota 58202 USA; and
6
Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 USA
2
Phylogenetic relationships among genera of tribe Malveae (Malvaceae, subfamily Malvoideae) were reconstructed using sequences
of the internal transcribed spacer (ITS) region of the 18S–26S nuclear ribosomal repeat. Newly generated sequences were combined
with those available from previous generic level studies to assess the current circumscription of the tribe, monophyly of some of the
larger genera, and character evolution within the tribe. The ITS data do not support monophyly of most generic alliances as presently
defined, nor do the data support monophyly of several Malveae genera. Two main well-supported clades were recovered, which
correspond primarily to taxa that either possess or lack involucral bracts, respectively. Chromosomal evolution has been dynamic in
the tribe with haploid numbers varying from n 5 5 to 36. Aneuploid reduction, hybridization, and/or polyploidization have been
important evolutionary processes in this group.
Key words:
Bayesian analysis; ITS; Malvaceae; Malveae; Malvoideae; molecular phylogeny; parsimony analysis.
In recent years, morphological and molecular evidence have
shown that many of the traditional families of the Malvales
are not monophyletic (Judd and Manchester, 1997; Alverson
et al., 1998, 1999; Bayer et al., 1999). As a result, an expanded
circumscription of the Malvaceae has been created, which is
composed of nine subfamilies: Bombacoideae (formerly Bombacaceae, in part), Brownlowioideae, Byttnerioideae, Dombeyoideae, Grewioideae, Helicteroideae, Malvoideae (formerly
Malvaceae), Sterculioideae (formerly Sterculiaceae, in part),
and Tilioideae (formerly Tiliaceae, in part) (Bayer et al., 1999;
Bayer and Kubitzki, 2003). Subfamily Malvoideae (Eumalvoideae of Baum et al., 2004) has consistently emerged as a
monophyletic group on the basis of both morphological and
molecular data (Judd and Manchester, 1997; Alverson et al.,
1999; Bayer et al., 1999). In the most recent treatment of Malvoideae, Bayer and Kutbitzki (2003) divide the subfamily into
four tribes: Gossypieae, Hibisceae, Kydieae, and Malveae.
As considered here, tribe Malveae includes approximately
70 genera (;1000 species) that encompass the majority of the
morphological and taxonomic diversity in the subfamily (Table
1) (Fryxell, 1997). Traditionally, members of the Malveae
have been characterized by a combination of several morphological characters: schizocarpic fruits (sometimes a capsule),
mericarps numbering 3 to over 20 and equal to the number of
free styles, antheriferous apex of the staminal column, and the
absence of lysigenous cavities (‘‘gossypol glands’’) (Fryxell,
1988; Bayer and Kubitzki, 2003). The genera of Malveae exhibit a broad geographic distribution, with representatives in
both tropic and temperate areas exploiting a variety of habitats.
Around 15 of the 70 Malveae genera have mostly temperate
distributions, while some of the largest genera in the tribe
(Abutilon, Sida, Nototriche) have primarily tropical distributions (Table 1).
Various interpretations of the composition and subdivision
of tribe Malveae have been proposed. Table 2 outlines the
major classification schemes, beginning with Bentham and
Hooker (1862), for tribe Malveae and for genera currently
placed in the tribe. Bentham and Hooker divided the tribe into
four subtribes on the basis of carpel arrangement and ovule
number and position: Abutilinae, Malopinae, Malvinae, and
Sidinae (as Abutileae, Malopeae, Eumalveae, and Sideae, respectively). Schumann (1890) later reassigned three genera
(Malope, Kitaibela, Palaua) to a separate tribe Malopeae due
to the irregular arrangement of their carpels into superimposed
verticils (i.e., not in single whorl). The remaining genera of
the Malveae were placed into one of three subtribes by Schumann (Abutilinae, Malvinae, or Sidinae) based on carpel morphology. This classification was followed by Edlin (1935) and
slightly modified by Kearney (1949, 1951) who erected a
fourth subtribe, Corynabutilinae. Hutchinson (1967) further restructured the family and tribes by including the tribes Abutileae (composed of subtribes Abutilinae and Sidinae), Malopeae, and Malveae (containing subtribes Corynabutilinae and
Malvinae). Bastardia and Bastardiopsis, the two Malveae genera that have capsules rather than schizocarps, were transferred
Manuscript received 13 June 2004; revision accepted 21 December 2004.
The authors thank the curators and staff of the following herbaria for use
of herbarium specimens for this study: CHR, LL, MA, MO, NY, and TEX;
and R. Small and two anonymous reviewers for comments on the manuscript.
This research was supported by a National Science Foundation (NSF) Doctoral Dissertation Improvement Grant to JAT and BBS (DEB-9902230); the
Foundation for Research, Science, and Technology to SJW; the Virginia Academy of Science to TABS; an NSF grant to JCL, Christopher Austin, Siegfried
Detke, and Kevin Young (DBI-0115985); an NSF grant to JCL and Paul
Fryxell (DEB-9420233), and a research grant of MCYT (REN2002–00339)
to JFA. The authors each individually express their gratitude to Paul Fryxell
for his assistance, knowledge, and generosity throughout many years of studying the Malvaceae.
7
Author for reprint requests (e-mail: jtate@ufl.edu). Current address: Florida Museum of Natural History, University of Florida, P.O. Box 117800,
Gainesville, Florida 32611 USA.
1
584
Alliance
Abutilon
Kearnemalvastrum
Malacothamnus
Malope
Malva
Pantropical
Brazil
Neotropics
9
3–4
8
10
1
6
7
61
2
4
4
2
1
19
2
15
;100
8
2
26
20
24
5
201
4
5
2
1
4
;75
33
5
2
7
10
1
8
2
3
;60
12
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Texas, Mexico
Neotropics
W Mexico
S America
S Texas to NE Mexico
Temperate Chile & Argentina
Colombia, Venezuela
Neotropics
Mexico, Paraguay/Argentina
SW Texas & NE Mexico, S America
W USA & Mexico, S America, Mediterranean
S Texas to central Mexico
Temperate Argentina
USA to Argentina
S Texas & N Mexico, Bolivia & Argentina
Mexico to Costa Rica
Pantropical
Mexico & West Indies to Argentina
Ecuador & Peru
Neotropics
S Africa
S USA, Mexico, S America
W Mexico
Mexico, central America
Mexico
Mexico, S America
W Mexico, Bolivia/Paraguay
W Texas, N Mexico
SW USA, N Mexico, Baja California
Chile, also S Peru
Neotropics (Mexico, West Indies, Bolivia)
Temperate Argentina
Mexico to Costa Rica, Colombia
W USA & Canada, Illinois/Virginia
California/Baja California
Mexico to Panama
Mexico, Guatemala, Carribean
E Europe, W Asia
Mediterranean
Mediterranean to central Asia
Europe, Middle East, central Asia
;13
201
1
15
n
n
n
n
58
5 7, 14
5 15
5 14
58
58
5 21
5 6, 7
57
58
5 [11], 16?
58
58
5 8, 16
58
5 16
5 6, 7, 8, 14, 16, 17, 21, 28
5 16
5?
57
5 22
5 13, 14, 15, 18, 30, 45
5 13
5 15
5 12, 16
57
5 7, 15
58
5 15
5 6, 12
5 6, 12
5 6, 12, 18
5 16
5 33
5 17
5 16
5 17
5 21, 22
5 22, 25
5 13, 21
5 13, 14, 20, 21, 22, 25, 35,
42
5 14, 21, 42, 56
5 21, 38, 42, 56
5 21, 22?
5 6, 12, 18, 24
Distribution
Mediterranean, California/Baja California, Australia
Europe, Asia, N Africa
Macaronesia
N America & S America
585
Malvastrum
Lavatera L.
Malva L.
Navaea Webb & Berthelot
Malvastrum A. Gray
n 5 7, 8, 14, 16, 18, 21, 36
n5?
n57
MALVEAE
Gaya
Haploid chromosome numbers
;160
1
4
ET AL.—ITS PHYLOGENY OF TRIBE
Batesimalva
Abutilon Mill.
Akrosida Fryxell & Fuertes
Allosidastrum (Hochr.) Krapov., Fryxell & D.M.
Bates
Allowissadula D.M. Bates
Bastardia H.B.K.
Bastardiastrum (Rose) D.M. Bates
Bastardiopsis (K. Schum.) Hassl.
Billieturnera Fryxell
Corynabutilon (K. Schum.) Kearney
Dendrosida Fryxell
Herissantia Medik.
Hochreutinera Krapov.
Krapovickasia Fryxell
Malvella Jaub. & Spach
Meximalva Fryxell
Neobaclea Hochr.
Pseudabutilon R.E. Fr.
Rhynchosida Fryxell
Robinsonella Rose & Baker f.
Sida L.
Sidastrum Baker f.
Tetrasida Ulbr.
Wissadula Medik.
Anisodontea Presl
Anoda Cav.
Periptera DC.
Bakeridesia Hochr.
Batesimalva Fryxell
Briquetia Hochr.
Dirhamphis Krapov.
Fryxellia D. M. Bates
Horsfordia A. Gray
Cristaria Cav.
Gaya H.B.K.
Lecanophora Speg.
Kearnemalvastrum D. M. Bates
Iliamna (Greene) Wiggins
Malacothamnus Greene
Neobrittonia Hochr.
Phymosia Desv. ex Ham.
Kitaibela Willd.
Malope Linn.
Alcea L.
Althaea L.
Number of
species
TATE
Anisodontea
Anoda
Genus
April 2005]
TABLE 1. Genera of tribe Malveae (Malvaceae), their alliance associations, reported chromosome numbers and geographic distributions (Fryxell, 1997; Bayer and Kubitzki, 2003, with
modification). Chromosome numbers in brackets are those reported in the literature, but are seemingly out of sync with numbers published for the rest of the genus.
586
TABLE 1.
Continued.
Alliance
Modiola
Sidalcea
Sphaeralcea
Modiola Moench
Number of
species
1
Haploid chromosome numbers
n59
n
n
n
n
n
n
n
n
Sidalcea A. Gray
Acaulimalva Krapov.
Andeimalva J. A. Tate
Calyculogygas Krapov.
Calyptraemalva Krapov.
Eremalche Greene
Fuertesimalva Fryxell
Monteiroa Krapov.
Napaea L.
Nototriche Turcz.
Palaua Cav.
Sidasodes Fryxell & Fuertes
Sphaeralcea St.-Hil.
Tarasa Phil.
Urocarpidium Ulbr.
;20
19
4
1
1
3
14
8
1
;100
15
2
;40
27
1
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
5 5, 15, 50
5 12
5?
5?
5 21
5?
5 21
5 12, 14, 15, 21, 28, 30, 34,
35, 42, 56
5 10, 20, 30
55
56
55
5?
5 10, 20
5 5, 10, 15
5 10
5 [14], 15
5 5, 10, 15, 20
55
55
5 5, 10, 15, 25
5 5, 10
55
Tasmania
Tasmania, S/SE Australia
New Zealand
Australia
New Zealand
central USA to NE Mexico
W USA and NW Mexico
Andes
Andes
Uruguay
Brazil
S California, N Baja California
Andes, Mexico
S Brazil, N Argentina
E USA
Andes
Coastal Peru & Chile
Colombia, Ecuador, Peru
Temperate N & S America
Andes, Mexico
Andes, Mexico
BOTANY
5
1
1
2
6
12
2
9
Pantropical and subtropical, extending to temperate
regions
S America
OF
Modiolastrum K. Schum.
Tropidococcus Krapov.
Asterotrichion Klotzsch
Gynatrix Alef.
Hoheria A. Cunn
Lawrencia Hook.
Plagianthus J.R. & G. Forst.
Callirhoë Nutt.
Distribution
AMERICAN JOURNAL
Plagianthus
Genus
[Vol. 92
April 2005]
TATE
ET AL.—ITS PHYLOGENY OF TRIBE
to tribe Hibisceae. Tribe Abutileae was created to accommodate genera with decurrent stigmas, while genera with apical
stigmas remained in tribe Malveae. Hutchinson (1967) distinguished the subtribes of Abutileae and Malveae by ovule number and position.
Bates (1968) completely revised the classification scheme
by eliminating the subtribes and creating 13 informal generic
alliances within a single tribe Malveae (Table 2). Bates’ generic alliances were based on morphology and chromosome
number and were thought to reflect better phylogenetic affinities (Bates, 1968). Bates and Blanchard (1970) later expanded
this classification scheme to include 16 alliances. In his treatment of the Mexican genera of Malvaceae, Fryxell (1988)
slightly modified the classification of Bates and Blanchard.
The major changes involved removing several genera from the
Abutilon alliance and creating three new alliances (Herrisantia, Robinsonella, and Sida), segregating Modiola from the
Sphaeralcea alliance into the Modiola alliance, reassigning
Callirhoë to the Sidalcea alliance, renaming the Malacothamnus as the Phymosia alliance and adding Neobrittonia to it
from the Abutilon alliance, and creating two new alliances for
the newly described genera Batesimalva and Fryxellia.
Most recently, Bayer and Kubitzki (2003) provided a comprehensive treatment for the tribe, as well as for the entire
subfamily and family. Fourteen Malveae alliances were maintained, but their generic compositions were altered somewhat
(Table 2). The genera previously segregated into the Herrisantia, Robinsonella, and Sida alliances by Fryxell (1988)
were subsumed into the Abutilon alliance. Members of the
Bakeridesia and Fryxellia alliances were included with the Batesimalva alliance. The Malacothamnus alliance was maintained in name as originally proposed by Bates and Blanchard
(1970), but its generic composition follows Fryxell (1988).
The Napaea alliance was included with the Sphaeralcea alliance. In the present study, we will follow the taxonomy of
Bayer and Kubitzki (2003) with slight modification to reflect
recent taxonomic changes: the addition of Navaea to the Malva alliance (Fuertes Aguilar et al., 2003), Tropidococcus to the
Modiola alliance (Fernandez et al., 2003; Krapovickas, 2003)
and Andeimalva to the Sphaeralcea alliance (Tate, 2003).
Recent molecular studies of the Malvales and the Malvoideae (as Malvaceae sensu stricto) have provided preliminary
evidence for phylogenetic relationships within the subfamily
as well as within the tribe Malveae. Tribe Gossypieae was
sister to Malveae based on rbcL and atpB (Bayer et al., 1999)
and ndhF (Alverson et al., 1999) sequence data. All five tribes
were represented in a recent phylogenetic analysis of tribe Hibisceae, using chloroplastic ndhF and rpl16 intron sequences
(Pfeil et al., 2002). Although only a few genera of Malveae
were included, the resulting trees placed Malveae and Gossypieae at the base of an unresolved clade and sister to most
of the Hibisceae. Another cpDNA based study, using restriction site data (La Duke and Doebley, 1995), sampled more
extensively in the Malveae and placed the tribe in a clade that
was sister to the remaining tribes of subfamily Malvoideae.
Although La Duke and Doebley’s study did not support monophyly of the Malveae alliances, it did identify two major
clades: one composed of the Abutilon and Sida alliances and
the other composed of the remaining alliances. A recent phylogenetic analysis based on sequence data from the internal
transcribed spacer (ITS) regions of the 18–26S nuclear ribosomal repeat (Fuertes Aguilar et al., 2003) examined the phylogenetic relationships of the Abutilon and Sida alliances. Al-
MALVEAE
587
though their sampling was not exhaustive, neither alliance was
supported as monophyletic (Fuertes Aguilar et al., 2003).
Previous studies have demonstrated that sufficient variation
exists in ITS to resolve phylogenetic relationships within and
between genera in the Malvoideae (Seelanan et al., 1997) and
particularly in the Malveae (Ray, 1995; Whittall et al., 2000;
Andreasen and Baldwin, 2001; Fuertes Aguilar et al., 2003;
Tate and Simpson, 2003). Furthermore, several of these studies
have also revealed that some genera are not monophyletic as
currently circumscribed. Among these are Abutilon and Sida
(Fuertes Aguilar et al., 2003), Malva and Lavatera (Ray,
1995), and Tarasa (Tate and Simpson, 2003). We extended
these earlier studies with a broader sample representing most
of the genera in tribe Malveae. The main objectives of this
study were to reconstruct phylogenetic relationships in tribe
Malveae, to assess the amount of congruence between the inferred relationships and the existing classification, to identify
potential morphological synapomorphies that might support
the reconstructed clades, and finally, to examine character evolution within the tribe.
MATERIALS AND METHODS
Taxon sampling—We sampled 68 genera (121 species) in our study representing all of the 14 alliances recognized by Bayer and Kubitzki (2003). To
assess monophyly of the genera, as well as intrageneric variation, two or more
species from the same genus were included when possible. The outgroups
included Gossypium, Kokia, Lebronnecia, and Thespesia (tribe Gossypieae),
and Howittia (incertae sedis fide Bayer and Kubitzki, 2003). Members of the
Gossypieae were included based on previous molecular phylogenies for subfamily Malvoideae, which indicated that tribe Gossypieae is sister to Malveae
(Alverson et al., 1999; Bayer et al., 1999). Originally, Howittia was included
in the Malveae by Bentham and Hooker (1862), but later workers suggested
that it should be placed in tribe Hibisceae (Edlin, 1935; Fryxell, 1968). Recent
molecular analyses based on cpDNA sequence data found Hibisceae to be
paraphyletic, with four Hibisceae genera (Camptostemon, Radyera, Howittia,
and Lagunaria) placed sister to the remaining members of the Malvoideae
(Pfeil et al., 2002). Tribes Malveae and Gossypieae (both of which were
monophyletic) formed a clade sister to a clade containing tribes Decaschistieae, Malvavisceae, and the remaining Hibisceae genera (Pfeil et al., 2002).
Although it is clear that Howittia does not belong in either tribe Hibisceae or
Malveae, we include the genus here to represent a more distantly related
lineage of Malvoideae.
The taxa sampled, voucher information, and GenBank accession numbers
are available as a Data Supplement (Appendix 1) accompanying the online
version of this article.
DNA extraction and ITS amplification—Total DNA was extracted from
fresh material, herbarium specimens or silica—gel-dried material (Chase and
Hills, 1991) by various modifications of the CTAB protocol (Doyle and
Doyle, 1987). The internal transcribed spacer (ITS) region of the 18S–26S
nuclear ribosomal repeat was amplified by the polymerase chain reaction
(PCR) as previously described (Fuertes Aguilar et al., 2003; Tate and Simpson, 2003). Amplification products were separated on a 1% agarose gel,
stained with ethidium bromide, and then visualized with UV on a transilluminator. PCR products were cleaned using QIAquick spin columns (Qiagen,
Valencia, California, USA) following the manufacturer’s instructions. Cycle
sequencing was performed using Big Dye terminator chemistry (Applied Biosystems, Foster City, California, USA). Bidirectional automated sequencing
using the forward and reverse amplification primers was conducted on an ABI
3700 or 377 at the DNA Analysis Laboratory at The University of Texas at
Austin or an ABI 3100 at The University of North Dakota.
Sequence alignment and phylogenetic analysis—The boundaries of ITS
were determined by comparison to a published Gossypium sequence in
588
AMERICAN JOURNAL
OF
BOTANY
[Vol. 92
TABLE 2. Historical classification of genera currently placed in tribe Malveae (see Table 1). n/a means not applicable (i.e., genus not found in
geographical region under study). Genera are listed alphabetically within their current generic alliance (Bayer and Kubitzki, 2003).
Genus
Year
described
Bentham and Hooker 1862
Schumann 1890
Edlin 1935
Kearney 1951
(American genera only)
Hutchinson 1967
Tribe/subtribe
Tribe/subtribe
Tribe/subtribe
Tribe/subtribe
Tribe/subtribe
Abutilon
Akrosida
Allosidastrum
Allowissadula
Bastardia
Bastardiastrum
Bastardiopsis
Billieturnera
Corynabutilon
1754
1992
1988
1978
1822
1978
1910
1982
1949
Malveae/Abutilinae
–a
–
–
Malveae/Sidinae
–
–
–
–
Malveae/Abutilinae
–
–
–
Malveae/Sidinae
–
–
–
–
Malveae/Abutilinae
–
–
–
Malveae/Sidinae
–
Malveae/Sidinae
–
–
Dendrosida
Herrisantia
Hochreutinera
Krapovickasia
Malvella
Meximalva
Neobaclea
1971
1788
1970
1978
1855
1975
1929
–
–
–
–
Malveae/Sidinaeb
–
–
–
–
–
–
Malveae/Sidinaeb
–
–
–
Malveae/Sidinaeh
–
–
–
–
Pseudabutilon
Rhynchosida
Robinsonella
Sida
Sidastrum
Tetrasida
Wissadula
Anisodontea
Anoda
Periptera
Bakeridesia
Batesimalva
Briquetia
Dirhamphis
Fryxellia
Horsfordia
Cristaria
Gaya
Lecanophora
Kearnemalvastrum
Iliamna
Malacothamnus
Neobrittonia
Phymosia
Kitaibela
Malope
Alcea
1908
1978
1897
1753
1892
1916
1787
1844
1785
1824
1913
1975
1902
1970
1974
1887
1799
1822
1926
–
–
–
Malveae/Sidinae
–
–
Malveae/Abutilinae
Malveae/Abutilinaec
Malveae/Sidinae
–
–
–
–
–
–
–
Malveae/Sidinae
Malveae/Sidinae
–
–
–
–
Malveae/Sidinae
–
–
Malveae/Abutilinae
Malveae/Abutilinaec
Malveae/Sidinae
–
–
–
–
–
–
–
Malveae/Sidinae
Malveae/Sidinae
–
1967
1906
1906
1905
1825
1802
1735
1753
Althaea
1753
Lavatera
1753
Malva
1753
–
–
–
–
Malveae/Abutilinaec
Malopeae
Malopeae
Malveae/Eumalvinaed
Malveae/Eumalvinae
Malveae/Eumalvinae
Malveae/Eumalvinae
Malveae/Eumalvinaee
Malveae/Eumalvinae
Malveae/Abutilinae
–
Malveae/Sidinaef
–
Malveae/Sidinae
Malveae/Sidinaef
Malveae/Sidinae
Malveae/Eumalvinae
Navaea
1836
Malvastrum
1849
Modiola
Modiolastrum
Asterotrichion
Gynatrix
Hoheria
Lawrencia
Plagianthus
Callirhoë
1794
1891
1841
1862
1839
1840
1775
1821
Malveae/Abutilinae
–
Malveae/Sidinae
Malveae/Sidinae
–
–
Malveae/Abutilinae
–
Malveae/Sidinae
Malveae/Sidinae
Malveae/Abutilinae
–
Malveae/Sidinae
–
–
Malveae/Abutilinae
Malveae/Sidinae
Malveae/Sidinae
–
Malveae/Abutilinae
–
–
–
Malveae/Sidinae
–
Malveae/Sidinae
–
Malveae/Corynabutilinae
–
Malveae/Abutilinaei
–
–
–
–
Malveae/Corynabutilinae
Malveae/Abutilinae
–
Malveae/Sidinae
Malveae/Sidinae
Malveae/Sidinaeb
Malveae/Sidinae
Malveae/Abutilinae
–
Malveae/Sidinae
Malveae/Sidinae
Malveae/Abutilinae
–
Malveae/Sidinae
–
–
Malveae/Abutilinae
Malveae/Sidinae
Malveae/Sidinae
Malveae/Sidinaej
Abutileae/Abutilinae
–
–
–
Hibisceae
–
Hibisceae
–
Malveae/Corynabutilinae
–
Abutileae/Abutilinaem
–
–
Abutileae/Sidinae
–
Malveae/Corynabutilinae
Abutileae/Abutilinae
–
Malveae/Sidinae
Malveae/Sidinae
Malveae/Sidinaeb
Malveae/Sidinae
Abutileae/Abutilinae
Abutileae/Abutilinaec
Abutileae/Sidinae
Abutileae/Sidinae
Abutileae/Abutilinae
–
Abutileae/Sidinae
–
–
Abutileae/Abutilinae
Abutileae/Sidinae
Abutileae/Sidinae
Malveae/Sidinaej
–
–
–
–
Malveae/Abutilinaec
Malopeae
Malopeae
Malveae/Eumalvinaed
Malveae/Malvinae
–
–
–
Malveae/Abutilinae
–
Malopeae
Malopeae
–
–
Malveae/Abutilinae
Malveae/Abutilinae
Malveae/Abutilinae
Malveae/Abutilinae
n/a
n/a
–
–
Abutileae/Abutilinae
Abutileae/Sidinae
Abutileae/Abutilinae
Abutileae/Abutilinae
Malopeae
Malopeae
Malveae/Malvinaed
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
–
n/a
–
Malveae/Malvinae
Malveae/Malvinae
Malveae/Abutilinae
Abutileae/Sidinae
Malveae/Abutilinae
–
Malveae/Sidinaef
–
Malveae/Sidinae
Malveae/Sidinaef
Malveae/Sidinae
Malveae/Malvinaeg
Malveae/Abutilinae
Malveae/Abutilinae
–
–
Malveae/Sidinae
Malveae/Sidinae
Malveae/Sidinae
–
Malveae/Abutilinae
Malveae/Abutilinaek
n/a
n/a
n/a
n/a
n/a
Malveae/Malvinae
Abutileae/Abutilinae
Malveae/Abutilinaek
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
e
April 2005]
TABLE 2.
TATE
ET AL.—ITS PHYLOGENY OF TRIBE
MALVEAE
589
Extended.
Bates 1968
Bates and Blanchard 1970
Fryxell 1988
(Mexican genera only)
Bayer and Kubitzki 2003
Generic alliance
Generic alliance
Generic alliance
Generic alliance
Abutilon
–
–
–
Abutilon
–
Abutilon
–
Abutilon
Abutilon
–
–
–
Abutilon
–
Abutilon
–
Abutilon
Abutilon
–
Sida
Abutilon
Abutilon
Abutilon
n/a
Abutilon
n/a
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
–
–
–
–
–
–
Abutilon
–
–
–
–
–
–
Abutilon
Sida
Herrisantia
Abutilon
Sida
Sida
Sida
n/a
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
–
Abutilon
Abutilon
–
Abutilon
Abutilon
Anisodontea
Anoda
Anoda
Abutilon
–
Abutilon
–
–
Sphaeralcea
Gaya
Gaya
Gaya
Abutilon
–
Abutilon
Abutilon
–
Abutilon
Abutilon
Anisodontea
Anoda
Anoda
Bakeridesia
–
Abutilon
–
–
Bakeridesia
Gaya
Gaya
Gaya
n/a
Sida
Robinsonella
Sida
Sida
n/a
Abutilon
n/a
Anoda
Anoda
Bakeridesia
Batesimalva
Batesimalva
Batesimalva
Fryxellia
Batesimalva
n/a
Gaya
n/a
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Abutilon
Anisodontea
Anoda
Anoda
Batesimalva
Batesimalva
Batesimalva
Batesimalva
Batesimalva
Batesimalva
Gaya
Gaya
Gaya
Kearnemalvastrum
Malacothamnus
Malacothamnus
Abutilon
Malacothamnus
Malope
Malope
–
Kearnemalvastrum
Malacothamnus
Malacothamnus
Abutilon
Malacothamnus
Malope
Malope
–
Kearnemalvastrum
n/a
Phymosia
Phymosia
Phymosia
n/a
n/a
Malva
Kearnemalvastrum
Malacothamnus
Malacothamnus
Malacothamnus
Malacothamnus
Malope
Malope
Malva
Malva
Malva
n/a
Malva
Malva (in part), Anisodontea (in part)
Malva (in part), Anisodontea (in part)
Malva
Malva
Malva
Malva
Malva
Malva
–
–
–
–
Malvastrum (in part), Sphaeralcea (in part)
Malvastrum (in part), Sphaeralcea (in part)
Malvastrum
Malvastrum
Sphaeralcea
Sphaeralcea
Plagianthus
Plagianthus
Plagianthus
Plagianthus
Plagianthus
Malva
Sphaeralcea
Sphaeralcea
Plagianthus
Plagianthus
Plagianthus
Plagianthus
Plagianthus
Callirhoe
Modiola
n/a
n/a
n/a
n/a
n/a
n/a
Sidalcea
Modiola
Modiola
Plagianthus
Plagianthus
Plagianthus
Plagianthus
Plagianthus
Sidalcea
Sidalcea
Sidalcea
Sidalcea
Sidalcea
590
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TABLE 2.
OF
BOTANY
[Vol. 92
Continued.
Genus
Year
described
Sidalcea
1849
Acaulimalva
Andeimalva
Calyculogygas
Calyptraemalva
Eremalche
Fuertesimalva
Monteiroa
Napaea
1974
2003
1960
1965
1906
1996
1951
1753
Nototriche
Palaua
Sidasodes
Sphaeralcea
Tarasa
Urocarpidium
1863
1785
1992
1825
1891
1916
Bentham and Hooker 1862
Schumann 1890
Edlin 1935
Kearney 1951
(American genera only)
Hutchinson 1967
Tribe/subtribe
Tribe/subtribe
Tribe/subtribe
Tribe/subtribe
Tribe/subtribe
Malveae/Eumalvinae
–
–
–
–
–
–
–
Malveae/Eumalvinae
–
Malopeae
–
Malveae/Abutilinae
–
–
Malveae/Malvinae
Malveae/Malvinae
Malveae/Malvinae
Malveae Malvinae
–
–
–
–
–
–
–
Malveae/Malvinae
–
–
–
–
–
–
–
Malveae/Malvinae
–
–
–
–
Malveae/Abutilinael
–
–
Malveae/Malvinae
–
–
Abutileae/Abutilinae
Abutileae/Abutilinae
Abutileae/Abutilinae
–
Abutileae/Abutilinae
Malvinae
–
Malopeae
–
Malveae/Abutilinae
–
–
Malveae/Sidinae
Malopeae
–
Malveae/Abutilinae
Malveae/Sidinae
–
Malveae/Abutilinae
Malopeae
–
Malveae/Abutilinae
Malveae/Abutilinae
Malveae/Abutilinae
Abutileae/Sidinae
Malopeae
–
Abutileae/Abutilinae
Abutileae/Sidinae
Abutileae/Abutilinae
a
–, genus not described yet or not included in treatment (details of synonymy not given).
included under Sida.
c included under Sphaeralcea.
d included under Althaea.
e included under Lavatera.
f included under Plagianthus.
g included under Malva.
h as Pseudobastardia (see Brizicky, 1968).
i as Gayoides (see Brizicky, 1968).
j included under Cristaria.
k included under Modiola.
l included under Malvastrum.
m as Bogenhardia (see Brizicky, 1968).
b
GenBank (U12719, http://www.ncbi.nlm.nih.gov/). Forward and reverse sequences were assembled into contigs and edited using Sequencher (Gene
Codes Corporation, 1995). The sequences were aligned using Clustal X
(Thompson et al., 1997), with manual adjustments as needed. Conserved regions in ITS1 (Liu and Schardl, 1994) and ITS2 (Hershkovitz and Zimmer,
1996) were used to identify potential pseudogenes and confirm the alignment
at those positions. Sequences that did not have these conserved regions were
considered to be pseudogenes and were excluded from the phylogenetic analyses. The highly conserved 5.8S was not available for all sequences, so the
region was excluded from the phylogenetic analyses. Because homology assessment for several nucleotide positions across distantly related genera was
uncertain, we employed a conservative alignment strategy. By setting the gap
penalty low, we favored introducing gaps, which created autapomorphies rather than forcing synapomorphies. We also conducted phylogenetic analyses
with and without these uncertain regions as described next.
Both parsimony and Bayesian analyses of the ITS sequence data were conducted. For parsimony, heuristic tree searches were performed using PAUP*
version 4.0b10 (Swofford, 2002) with 1000 random addition replicates, tree
bisection reconnection (TBR) branch swapping, ACCTRAN character-state
optimization, and gaps coded as missing. To reduce the amount of time spent
swapping on suboptimal trees, only five trees were held at each replicate, to
an arbitrary maximum of 10 000 trees saved. The best trees were then
swapped to completion. Bootstrap support for the internal nodes was determined by 1000 bootstrap replications (Felsenstein, 1985) with uninformative
characters excluded and using the maximum likelihood parameters estimated
from Modeltest version 3.06 (Posada and Crandall, 1998) to conduct a neighbor-joining bootstrap.
Bayesian analyses were conducted using MrBayes 3.0 (Huelsenbeck and
Ronquist, 2001), with the likelihood parameters estimated using Modeltest,
the Markov chain Monte Carlo algorithm (Larget and Simon, 1999) with four
simultaneous chains (three heated and one cold), and trees saved every 100
generations. Two independent runs of two million generations each (corre-
sponding to at least five times the burn-in period) were performed to ensure
the analyses converged on the same ‘‘plateau.’’ Trees from the burn-in period
were discarded, and a 50% majority rule consensus tree was constructed from
the remaining trees (Wilcox et al., 2002). Posterior probabilities for the clades
reconstructed from each independent run were also compared to ensure proper
mixing (Huelsenbeck et al., 2002).
RESULTS
ITS sequence characteristics and phylogeny reconstruction—The aligned region, including ITS1 and ITS2, contained
644 characters: 166 characters were constant, 98 were parsimony uninformative, and 380 were parsimony informative.
ITS1 contributed 158 informative characters while ITS2 had
222. The ITS1 spacer varied in length from 253–297 base
pairs (bp), while ITS2 varied from 207–231 bp. The GC content of ITS1 was 46.7–60.1% (mean 53.3%) and ITS2 was
50–67.8% (mean 56.9%).
From parsimony analyses, 10 000 most parsimonious (MP)
trees of 2980 steps with a CI 5 0.28 (excluding uninformative
characters), RI 5 0.67, and RC 5 0.21 were saved. In the ITS
tree, both Gossypieae and Malveae are monophyletic, with
Malveae comprised of two main clades. One of the main
clades (hereafter referred to as clade A) consists of genera
placed in the Abutilon, Anoda, Batesimalva, Gaya, Malacothamnus (in part), Plagianthus, and Sphaeralcea (in part) alliances (Fig. 1). The second large clade (clade B) contains genera from the Anisodontea, Kearnemalvastrum, Malacothamnus, Malope, Malva, Malvastrum, Modiola, Sidalcea, and
Sphaeralcea alliances (Fig. 2). Most of the infratribal alliances
are not monophyletic and many of the genera are also not
April 2005]
TABLE 2.
TATE
ET AL.—ITS PHYLOGENY OF TRIBE
MALVEAE
591
Continued extended.
Bates 1968
Bates and Blanchard 1970
Fryxell 1988
(Mexican genera only)
Bayer and Kubitzki 2003
Generic alliance
Generic alliance
Generic alliance
Generic alliance
–
–
Sphaeralcea
Sphaeralcea
Sphaeralcea
–
Sphaeralcea
Sidalcea
–
–
Sphaeralcea
Sphaeralcea
Sphaeralcea
–
Sphaeralcea
Napaea
n/a
–
n/a
n/a
Sphaeralcea
Sphaeralcea
n/a
n/a
Sphaeralcea
–
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
–
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
–
Sphaeralcea
Sphaeralcea
Sphaeralcea
n/a
n/a
–
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
Sphaeralcea
monophyletic, including Abutilon, Iliamna, Sida, Tarasa, Tetrasida, and Wissadula. Taxa from two of the alliances are
found in both main clades, apart from the remainder of their
alliance as currently circumscribed. Sidasodes is placed in
clade A, while the remaining Sphaeralcea alliance genera are
in clade B, and Neobrittonia is in clade A, whereas the rest
of the Malacothamnus alliance is in clade B.
For Bayesian inference, the model that best fit the data set
was TrN 1 G 1 I (Tamura and Nei, 1993), as determined by
Modeltest. Trees corresponding to the burn-in period (approximately 200 000 generations) were discarded, and a 50% majority rule consensus was constructed from the remaining postburn-in trees (Figs. 3, 4). The Bayesian analysis recovered a
similar topology as the parsimony analyses, although a few of
the generic placements differed. These differences include for
clade A (Fig. 3): Horsfordia is unresolved in a clade with
Bakeridesia and Anoda 1 Periptera, Sida abutifolia is sister
to a clade containing S. linifolia 1 S. turneroides (rather than
sister to Dendrosida), conversely S. rhombifolia is sister to
Dendrosida (rather than sister S. linifolia 1 S. turneroides),
S. oligandra is unresolved at the base of a large clade containing most of the Abutilon alliance (rather than sister to Robinsonella), Malvella is also unresolved (rather than being sister to Allosidastrum), and S. hookeriana and S. hermaphrodita
are unresolved in the ‘‘Plagianthus’’ clade. In clade B (Fig.
4), the changes in the Bayesian topology include Anisodontea
as sister to a clade containing Callirhoë 1 Napaea and Alcea
1 Kitaibela (rather than sister to a more inclusive clade containing Malva 1 Lavatera and Malope), the Palaua species
are sister to Fuertesimalva 1 Urocarpidium (rather than sister
to the large clade containing most of clade B), and Tarasa
trisecta is unresolved with other Tarasa and Nototriche species (rather than sister to Nototriche).
DISCUSSION
Utility of ITS in tribe Malveae—In this study, we present
the first comprehensive phylogeny for tribe Malveae. Studies
in other angiosperm families have employed the ITS region
for phylogenetic reconstructions at the tribal level, including
one other Malvoideae tribe, Gossypieae (Seelanan et al.,
1997). However, the utility of this region for phylogenetic reconstruction at higher taxonomic levels certainly will depend
on the level of divergence for the genera under consideration.
Across tribe Malveae, the use of the ITS region for phylogeny
reconstruction is likely at its limit, given the alignment difficulties we experienced. For this same reason, the inclusion of
genera from other tribes of Malvoideae, most notably the Hibisceae, was not feasible. Similarly, the high homoplasy levels
[CI 5 0.28 (excluding uninformative characters), RC 5 0.21]
indicate that this marker may be beyond the limit for a tribal
level phylogeny. However, homoplasy levels have been shown
to increase when a large number of taxa are analyzed (Sanderson and Donoghue, 1989). Moreover, when log transformed
values for CI and number of taxa from our study are compared
to the regression analyses conducted by Givnish and Sytsma
(1997), our data fall within the range expected for DNA sequence data. The exclusion of troublesome areas in the Malveae alignment from the phylogenetic analyses did not produce conflicting relationships among the taxa, but did result
in a lack of resolution for several areas of the tree. As demonstrated by previous studies in the Malveae, however, the ITS
region does provide sufficient resolution at lower taxonomic
levels (Ray, 1995; Andreasen and Baldwin, 2001, 2003; Fuertes Aguilar et al., 2003; Tate and Simpson, 2003).
The challenges of using ITS for phylogeny reconstruction
in groups known or suspected to have experienced hybridization or polyploidization are widely appreciated (Baldwin et al.,
1995; Wendel et al., 1995; Alvarez and Wendel, 2003; Fuertes
Aguilar and Nieto Feliner, 2003). The ITS region, as part of
the nuclear ribosomal repeat, is expected to undergo concerted
evolution (Zimmer et al., 1980), and therefore, the repeats
within a given taxon are often assumed to be homogeneous.
In some cases, concerted evolution may fail to homogenize
the repeats in hybrids or allopolyploids, particularly if these
are recently formed entities (and sufficient time has not passed
for homogenization of the repeats), if the repeats are located
on different chromosomal segments (and interlocus concerted
evolution does not occur) or if the hybrid or polyploid reproduces asexually (Baldwin, 1992; Alvarez and Wendel, 2003).
Polyploidy has been well documented in tribe Malveae, not
only within genera, but also within species (see Fryxell, 1997).
Pseudogene formation, biased PCR amplification, and interlocus recombination are just a few of the processes that can
potentially confound the use of ITS for phylogeny reconstruc-
592
AMERICAN JOURNAL
OF
BOTANY
[Vol. 92
Figs. 1–2. Majority rule (50%) consensus of 10 000 MP trees based on ITS sequence data of tribe Malveae. Frequency of reconstructed clades is indicated
above the branches and bootstrap support (above 70%) for 1000 replicates is shown below the nodes. Alliance associations are shown at right and follow Bayer
and Kubitski (2003) with slight modification (see Table 1). Clade A.
tion (reviewed in Alvarez and Wendel, 2003). Despite these
potential shortcomings, the recovered generic relationships
based on ITS sequence data are also supported by geography,
chromosome number, and morphology (discussed later, Figs.
5, 6). Nonetheless, the findings presented here are preliminary
and require further corroboration from one or more indepen-
dent data sets, either from the chloroplast or from a low- or
single-copy nuclear gene. As a conservative measure, we do
not propose taxonomic changes for the tribe at present.
The traditional alliances are not monophyletic—The ITS
phylogeny does not support any of the historical classification
April 2005]
TATE
ET AL.—ITS PHYLOGENY OF TRIBE
Fig. 2.
schemes (Table 2). While several alliances are not monophyletic (i.e., are para- or polyphyletic), only two alliances (Malacothamnus and Sphaeralcea), as defined by Bayer and Kubitzki (2003), were found in both of the main clades. Neobrittonia, a member of the Malacothamnus alliance according
to Fryxell (1988) and Bayer and Kubitzki (2003), was placed
in clade A, while the remaining members of that alliance (Iliamna, Malacothamnus, and Phymosia) belong in clade B.
Similarly, Sidasodes was aligned with genera of the Sphaeralcea alliance (Fryxell, 1997; Bayer and Kubitzki, 2003) be-
MALVEAE
593
Clade B.
cause it shares a base chromosome number of x 5 5 with the
latter group. However, in the ITS phylogeny, Sidasodes colombiana was moderately supported (82% BS, 68% BPP) as
sister to two outlier species of Sida plus the Plagianthus alliance in clade A. Other than these two cases, the remaining
alliances are restricted to one of the two main clades. Within
these two large clades, however, most of the alliances are not
monophyletic. The exceptions are the Anoda alliance, with the
genera Anoda and Periptera (clade A; Figs. 1, 3), and the
Modiola alliance composed of Modiola and Modiolastrum
594
AMERICAN JOURNAL
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BOTANY
[Vol. 92
Figs. 3–4. Majority rule (50%) consensus of the post-burn in trees resulting from Bayesian analysis of ITS sequence data. Frequency of clades is shown
above the branches and represent Bayesian posterior probabilities. Taxa that change position as compared to the parsimony analysis (Figs. 1–2) are outlined in
grey. Clade A.
(clade B; Figs. 2, 4). Based on our present sampling, the monogeneric Kearnemalvastrum and Malvastrum alliances (clade
B) are also monophyletic.
The non-monophyly of the alliances in the ITS phylogeny
is generally consistent with a previous phylogeny based on
cpDNA restriction site data for Malveae (La Duke and Doebley, 1995). In that study, two main clades were recovered:
one containing Abutilon and Sida (Abutilon alliance) and a
second containing Alcea, Lavatera, and Malva (Malva alliance), Iliamna and Malacothamnus (Malacothamnus alliance),
Modiola and Modiolastrum (Modiola alliance), Sphaeralcea,
Tarasa, and Urocarpidium (Sphaeralcea alliance), and Callirhoë (Sidalcea alliance). The taxon sampling here is more extensive than in the cpDNA study, but essentially the same
April 2005]
TATE
ET AL.—ITS PHYLOGENY OF TRIBE
Fig. 4.
topology is recovered: one clade (clade A) contains the Abutilon, Anoda, Batesimalva, Gaya, and Plagianthus alliances,
with the aforementioned outliers from the Malacothamnus and
Sphaeralcea alliances, and the second large clade (clade B)
consists of genera from the Anisodontea, Kearnemalvastrum,
Malacothamnus, Malope, Malva, Malvastrum, Modiola, Sidalcea, and Sphaeralcea alliances. These two clades correspond primarily to the absence (clade A) or presence (clade
B) of involucral bracts subtending individual flowers (epica-
MALVEAE
595
Clade B.
lyx) (Figs. 5, 6). However, this character is variable in species
of Malvella (clade A, Fig. 5) and Callirhoë (clade B, Fig. 6)
and is completely absent in species of Nototriche (clade B,
Fig. 6). The loss of an epicalyx in Nototriche clearly represents
an independent event, because this genus is firmly placed within clade B. The lability of the presence or absence of an epicalyx in Malvella and Callirhoë is an interesting question that
merits further investigation, particularly from a developmental
perspective. Within each of the main clades, other morpholog-
596
AMERICAN JOURNAL
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[Vol. 92
Figs. 5–6. Summary of generic relationships in tribe Malveae based on ITS sequence data, showing the presence or absence of an epicalyx, geographic
distribution, and reported chromosome numbers. See also Table 1. Clade A.
ical characters (particularly those of the carpel previously emphasized for classification) appear to be quite labile, such that
general trends presently cannot be well defined. Similarly, the
lack of strong support, both bootstrap values and Bayesian
posterior probabilities, at the base of clades A and B, makes
rigorous character reconstructions tentative at this time. Early
classifications of tribe Malveae (Bentham and Hooker, 1862,
through Hutchinson, 1967) emphasized carpel morphology,
specifically the number and position of ovules in each carpel.
Bates (1968) proposed that the separation of uniovulate and
pluriovulate genera into separate tribes was likely artificial and
suggested that relationships between uniovulate and pluriovulate lineages should not be disregarded. Our findings based
on ITS data, support Bates’ astute observation that this character has been over-emphasized. Although paraphyly may be
an expected outcome of phylogenetic analyses (e.g., Brummitt,
2002), we find support for many of the recovered generic relationships based on chromosome number and geographic distribution (Figs. 5, 6), two criteria used by Bates to delimit the
alliances. For the remainder of the discussion, we will focus
April 2005]
TATE
ET AL.—ITS PHYLOGENY OF TRIBE
MALVEAE
597
Fig. 6. Clade B. Figure Abbreviations: Am, America; Argen, Argentina; Aus, Australia; Calif, California; Carib, Caribbean; Col, Colombia; CR, Costa Rica;
Medit, Mediterranean; Mex, Mexico; Tex, Texas; US, United States of America.
on the overall pattern of alliance and generic relatedness within clades A and B.
Alliances and genera of clade A—As mentioned, clade A
contains those genera that lack involucral bracts and belong to
the Abutilon, Anoda, Batesimalva, Gaya, Malacothamnus,
Plagianthus, and Sphaeralcea alliances (Figs. 1, 3, 5). The
clade as a whole is geographically and chromosomally diverse,
with taxa distributed in the Americas and the South Pacific,
and most with base chromosome numbers of x 5 6, 7, and 8
(few with x 5 5, 13, 15). Support for most of the basal nodes
is relatively weak (no BS, but 100% BPP for clade A), with
only a few receiving .70% BS (Figs. 1, 3). Only one alliance
(Anoda) is monophyletic based on the ITS data. Anoda and
Periptera were suggested to be closely related (Bates, 1987;
Fryxell, 1997); both genera possess ephemeral mericarp walls
(also found in Cristaria, to which they are not closely related)
and are primarily distributed in Mexico. Periptera (only one
species counted) has a haploid chromosome number of n 5
13, while Anoda is more chromosomally diverse with n 5 13,
14, 15, 18, 30, or 45 (Bates, 1987; Fryxell, 1997). Interestingly, Bates (1987) noted that the only n 5 13 species of
598
AMERICAN JOURNAL
Anoda (A. thurberi) forms a very robust hybrid (in greenhouse
crosses) with Periptera punicea (n 5 13) and that these may
represent a lineage derived within Anoda.
The Batesimalva alliance, composed of six genera (;36
species), is dispersed throughout clade A. Bakeridesia and
Horsfordia (both n 5 15) form a clade sister to the Anoda
alliance with good support (83% BS, 100% BPP) (Figs. 1, 3,
5). Both genera possess capitate stigmas and conspicuously
ornamented mericarps (Fryxell, 1997), but in Horsfordia the
wings are apical, and in Bakeridesia the wings are dorsal. No
relationship between the two genera was previously suggested.
Two other genera of the Batesimalva alliance, Briquetia (n 5
7) and Dirhamphis (n 5 7, 15), are included in a clade with
Hochreutinera (n 5 7, placed in the Abutilon alliance), plus
Gaya (n 5 6, 12, Gaya alliance) and Billieturnera (n 5 8,
Abutilon alliance). Krapovickas (1970) suggested a close relationship among Dirhamphis, Briquetia, and Hochreutinera,
which is supported by the ITS data (100% BS, 100% BPP).
Fryxell (1988) placed Dirhamphis, Horsfordia, Batesimalva,
and Briquetia in the Batesimalva alliance, primarily on the
basis of fruit morphology. Later, Fryxell and Stelly (1993)
advised that this alliance might need modification, because
new chromosome counts cast doubt on their association with
one another. Further, they suggested that the two Dirhamphis
species (one n 5 7, the other n 5 15) may not be congeneric.
In the ITS phylogeny, Fryxellia (n 5 8) is at the base of a
clade containing many Sida species (n 5 6, 7, 8, 14, 16, 28)
plus Dendrosida (n 5 21, see later), although this clade receives no support (Figs. 1, 3, 5). Fryxell and Valdés (1991)
speculated that Fryxellia could be related to Batesimalva or
Anoda because it shares some morphological features with
each genus. The placement of Neobrittonia (Malacothamnus
alliance) as sister to Batesimalva (Batesimalva alliance) and
not with the remaining Malacothamnus alliance in clade B
(compare Figs. 1, 3 to 2, 4) is supported by several characters
including a shared chromosome number of n 5 16 (although
one species of Batesimalva is n 5 12), the absence of an
epicalyx (involucral bracts) (Fig. 5), the presence of basal
spines on the dehiscent mericarps, rough or warty seeds, and
a pubescent staminal column, all of which are lacking in the
Malacothamnus alliance. Fryxell (1988, 1997) did not indicate
why he thought Neobrittonia should be included in the Malacothamnus alliance, but Bates (1968) originally placed Neobrittonia amongst the other pluriovulate genera of the Abutilon
alliance (e.g., Bakeridesia, Herissantia, Pseudabutilon, and
Wissadula).
Two of the three genera of the Gaya alliance (x 5 6),
Lecanophora and Cristaria, group together, while the third
genus, Gaya, is well removed from these. Cristaria and Lecanophora have long been allied because they share the
unique character of a carpocrater, a cup-shaped structure
formed by expanded bases of the carpels, which are fused to
the receptacle base (Bates, 1968; Fryxell, 1997). Although
Gaya shares a common chromosome number with these two
genera (Fig. 5), based on morphological characters, the genus
is relatively isolated from other genera. Bates (1968) and
Bates and Blanchard (1970) suggested that the genera of the
Gaya alliance actually represent two distinct lineages, one
composed of Gaya and the other of Cristaria 1 Lecanophora, which is supported here. In the ITS phylogeny, Gaya is
sister to a clade composed of Dirhamphis, Briquetia, and
Hochreutinera, although there is no bootstrap support and
only low BPP (75%) for this relationship (Figs. 1, 3). The
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more inclusive clade of the taxa (with Billieturnera) also had
no bootstrap support (Fig. 1), but the BPP was much higher
(99%) (Fig. 3).
The Abutilon alliance with 23 genera (;400 species) is the
largest in the tribe (Bayer and Kubitzki, 2003), and its members are also scattered throughout clade A (Figs. 1, 3). Several
genera of this alliance are apparently not monophyletic, e.g.,
Abutilon, Sida, and Tetrasida. The Abutilon-Sida complex was
the subject of a recent phylogenetic investigation using ITS
(Fuertes Aguilar et al., 2003), which also revealed that the two
genera were not monophyletic. Sida (100 spp.) has long been
recognized as a heterogeneous assemblage (Fryxell, 1985). Attempts to create a more natural group have resulted in several
segregate genera: Allosidastrum, Bastardiopsis, Billieturnera,
Dendrosida, Krapovickasia, Malvella, Meximalva, Rhynchosida, Sidastrum, and Tetrasida (see Fryxell, 1997). In the ITS
phylogeny, the remaining named Sida species still do not form
a monophyletic group (Figs. 1, 3), which is consistent with
the treatment of Fuertes Aguilar et al. (2003) and suggests that
further taxonomic adjustments are needed. A ‘‘core’’ Sida
clade (Fuertes Aguilar et al., 2003) was reconstructed with
Fryxellia (n 5 8) as its sister and Dendrosida (n 5 21) derived
within it (Fig. 5). These core Sida species have base chromosome numbers of both x 5 7 and x 5 8, and belong to
different sections as outlined by Fryxell (1985): S. cordifolia
(section Cordifoliae), S. turneroides (section Ellipticifoliae), S.
aggregata (section Muticae), S. glutinosa and S. urens (section
Nelavagae), S. rhombifolia (section Sidae), S. abutifolia (section Spinosae), and S. linifolia (section Stenindae). The remaining species of Sida are distributed throughout clade A
(Fig. 1), including S. fibulifera and S. platycalyx (incertae sedis, fide Fuertes Aguilar et al., 2003), which are sister to the
Sidastrum 1 Meximalva clade. Fryxell (1997) suggested that
Meximalva and Dendrosida were potentially close relatives to
Sida, and, in fact, both genera are closely related to species of
Sida, but they occur in separate clades. Similarly, S. oligandra
(section Oligandrae) is removed from the core Sida species
and is either sister to Robinsonella, based on parsimony analyses (Fig. 1), or is unresolved at the base of the larger Abutilon
alliance clade in the Bayesian analysis (Fig. 3). Two other Sida
species, S. hookeriana (section Hookeriana) and S. hermaphrodita (section Pseudo-Napaea), are included with members
of the Plagianthus alliance (100% BS, 100% BPP), plus Sidasodes colombiana of the Sphaeralcea alliance (82% BS)
(Figs. 1, 3). Sida hookeriana is found in Australia, so its inclusion with the Plagianthus group is more tenable, although
morphologically the two are disparate. The reconstruction of
S. hermaphrodita, which is found in the northeastern United
States, with the primarily South Pacific taxa of the Plagianthus
alliance is somewhat perplexing. Fryxell (1997) suggested that
this species might be better segregated into a distinct genus.
Fryxell and Fuertes Aguilar (1992) noted the similarity of Sidasodes (from the Andes of Colombia and Peru) to Sida hermaphrodita on the basis of fruit morphology; however, these
taxa were not thought to share other features. In the ITS study
by Fuertes Aguilar et al. (2003), S. hermaphrodita, S. hookeriana, and Sidasodes also formed a clade sister to the other
members of the Abutilon and Sida alliances, a finding that is
corroborated here. Chloroplast sequence data also support the
sister relationship of S. hermaphrodita and S. hookeriana to
genera of the Abutilon and Sida alliances (J. Beck, R. Small,
University of Tennessee, personal communication). Further
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ET AL.—ITS PHYLOGENY OF TRIBE
evaluation of these three species is needed to determine their
systematic position.
One of the other two genera from the Abutilon alliance that
is not monophyletic is Abutilon (160 spp.), one of the largest
Malveae genera. Like Sida, several species were removed and
new genera created, including Bakeridesia, Bastardia, Corynabutilon, Herissantia, Hochreutinera, Pseudabutilon, and
Tetrasida (Fryxell, 1997), most of which were included in the
present study. Only three species of Abutilon were sampled
here; these do not form a monophyletic group, but are paraphyletic to Bastardia and Bastardiopsis, two of the segregate
genera (Figs. 1, 3). These last two genera are the only ones in
the tribe that possess capsular fruits; all other genera are schizocarpous (Fryxell, 1997). Expanded sampling within Abutilon
certainly will be needed to determine if other species should
be removed and elevated to generic status.
The third genus of the Abutilon alliance resolved as nonmonophyletic in the ITS phylogeny is Tetrasida. The genus is
chromosomally unknown and currently contains five species
(Fryxell and Fuertes Aguilar, 1992; Fryxell, 2002) found in
Peru and Ecuador. Two species were included here to represent
the genus: T. chachapoyensis clusters with species of Wissadula (n 5 7), while T. weberbaueri is placed sister to Allowissadula holosericea (n 5 8) (Figs. 1, 3, 5). Krapovickas
(1969) included the species now considered as Tetrasida in
Abutilon section Tetrasida because he believed the condition
of a four-merous corolla (for which the genus was named) in
the species was not sufficiently consistent to merit generic recognition. However, Fryxell and Fuertes Aguilar (1992) resurrected the genus, including two species, and later described
three new species (Fryxell, 2002).
The Plagianthus alliance contains two genera from Australia (Gynatrix, Lawrencia), two from New Zealand (Hoheria,
Plagianthus), and one from Tasmania (Asterotrichion) for a
total of 23 species. Only Hoheria and Plagianthus have chromosome counts available and both are n 5 21 (Bates and
Blanchard, 1970). As discussed earlier, in the ITS phylogeny
(Figs. 1, 3), this alliance forms a moderately supported clade
(82% BS; 68% BPP) with Sidasodes colombiana (from the
Andes of Colombia and Peru), Sida hermaphrodita (section
Pseudo-Napaea, from the eastern United States), and S. hookeriana (section Hookerianae, from southwestern Australia).
The genera of the Plagianthus alliance are morphologically
diverse, ranging from annual herbs to prostrate subshrubs (Lawrencia) and large trees (Plagianthus and Hoheria) that differ
considerably in flower and fruit structure (Melville, 1966;
Lander, 1984). In this group, there is a tendency towards dioecy and a reduction in the number of locules in the ovary.
Plagianthus is unilocular with a single (rarely two) pendulous
ovule in each flower. The styles also show a gradation from
the long linear stigmas of Lawrencia and Gynatrix to clavate
forms in Plagianthus, Asterotrichion, and Hoheria.
Alliances and genera of clade B—Clade B was resolved as
a well-supported group (81% BS, 100% BPP) and is composed
of genera from the Anisodontea, Kearnemalvastrum, Malacothamnus, Malope, Malva, Malvastrum, Modiola, Sidalcea,
and Sphaeralcea alliances (Figs. 2, 4). As mentioned, all members of this clade retain the symplesiomorphic character of
having an epicalyx (with the exception of Nototriche, which
lacks involucral bracts, but clearly belongs in this clade) (Fig.
6). Clade B contains primarily American taxa, but also includes European, Asian, and South African genera. The pre-
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599
dominant base chromosome number is x 5 5 (Sphaeralcea
alliance, Sidalcea, Modiolastrum), although some clades are
complex chromosomally (e.g., the clade that includes Anisodontea through Callirhoë, with n 5 12, 13, 14, 21, 22, etc.)
(Fig. 6). As with clade A, many of the basal nodes in clade
B lack robust support (Figs. 2, 4). Relationships with the greatest support are those between congeneric taxa, although there
is strong support for the Malope 1 Navaea 1 Malva 1 Lavatera clade (91% BS; 100% BPP) and the Sphaeralcea 1
Tarasa 1 Nototriche clade (80% BS; 100% BPP) (Figs. 2, 4).
Three alliances in clade B are monophyletic: the Modiola alliance (78% BS, 76% BPP) composed of Modiola and Modiolastrum, and the monogeneric Kearnemalvastrum and Malvastrum alliances, although the sister groups to these latter
alliances are not well supported.
The Sphaeralcea alliance, the largest of clade B with 12
genera (;230 species) (excluding Sidasodes, which is better
aligned with genera of clade A), is not monophyletic (Figs. 2,
4). A clade composed of Andeimalva (n 5 6), along with
Nototriche, Sphaeralcea, and Tarasa (all x 5 5) is sister to
the rest of clade B. Other genera of the Sphaeralcea alliance
occur in a grade (Palaua, Urocarpidium, Fuertesimalva, Acaulimalva), with the remaining genera (Eremalche, Calyculogygas, Monteiroa, and Napaea) scattered amongst genera from
other alliances. In the case of Eremalche, the sister relationship
to Sidalcea (Sidalcea alliance) is supported by geographic distribution (both are found primarily in California and northern
Mexico), a morphological similarity and a shared basic chromosome number of x 5 5 (Fig. 6). Two other genera of the
Sphaeralcea alliance, Calyculogygas (n 5 5) and Monteiroa
(n 5 10), are in a clade with Modiola (n 5 9) and Modiolastrum (n 5 5, 15, 50). The placement of these two genera with
Modiolastrum is plausible given that they are all found in eastern South America (Argentina, Brazil, and Uruguay) and have
a common base chromosome number (Fig. 6). Modiola is a
monotypic genus that is widespread throughout pantropical
America, extending into temperate areas, and is thought to
represent an aneuploid lineage closely related to the x 5 5
genera of the Sphaeralcea alliance (Bates, 1968). Krapovickas
(1945) first suggested the close relationship of Modiola and
Modiolastrum based on gross morphological features, and later
noted that even their chromosomes were similar in size and
satellite morphology (Krapovickas, 1949). Both genera were
originally included in the Sphaeralcea alliance (Bates, 1968;
Bates and Blanchard, 1970), but were later separated into their
own generic alliance by Fryxell (1988). One other genus in
the Sphaeralcea alliance that is relatively isolated is Napaea
(n 5 [14], 15), a monotypic dioecious genus from the central
United States. Although originally allied to Sidalcea (Iltis and
Kawano, 1964; Bates, 1968), Napaea was later segregated into
its own alliance by Bates and Blanchard (1970). Krebs (1993)
noted that Napaea dioica shared pollen and fruit characters
with Sphaeralcea and suggested that it was aligned better with
genera of the Sphaeralcea alliance. In the ITS phylogeny, Napaea is sister to the cytologically complex genus Callirhoë
(Sidalcea alliance, see Table 1), which is found in the central
United States to northeastern Mexico (Dorr, 1990) (Fig. 6).
Interestingly, gynodioecy, a rather rare phenomenon in the
Malveae, occurs in several species of Callirhoë (Dorr, 1990).
Although Napaea and Callirhoë were placed in separate alliances, a close relationship between them was suggested (Fryxell, 1997). As is found throughout the Malveae, the ITS phylogeny indicates that the phylogenetic relationships of many
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AMERICAN JOURNAL
genera of the Sphaeralcea alliance are supported more by geography and shared chromosome numbers than some previously emphasized morphological characters.
Within the Sphaeralcea alliance, only Tarasa (n 5 5, 10)
is not monophyletic in the ITS phylogeny (Figs. 2, 4), a finding consistent with a previous study based on ITS and chloroplast sequence data (Tate and Simpson, 2003; Tate, 2003).
Sphaeralcea (n 5 5, 10, 15, 25) is sister (80% BS, 100% BPP)
to a clade containing Tarasa (n 5 5, 10) and Nototriche (n 5
5, 10, 15, 20) (no support for the next node, but the clade
including T. thyrsoidea and T. operculata has 100% BS, 100%
BPP) (Figs. 2, 4, 6). A close relationship among these three
genera was proposed by Krapovickas (1960, 1971), but they
were retained as separate genera because they were considered
to be distinct from one another. Species of Sphaeralcea (;40
spp.) are herbs or shrubs found in temperate mid-elevation
habitats of North and South America (Chile and Argentina)
with one- to three-seeded mericarps that have a dehiscent,
smooth upper portion and an indehiscent, laterally reticulate
lower portion (Fryxell, 1997). Tarasa species (;27 spp.) are
either annuals or perennial shrubs found at mid (800 m) to
high (up to 4000 m) elevations in the Andes (Peru to Chile
and Argentina) and have one-seeded mericarps that are completely dehiscent (Krapovickas 1954, 1960). Nototriche (;100
spp.) contains primarily acaulescent cushion plants (although
a handful of annual species have been described) found above
;4000 m in the Andes from Ecuador to southern Chile and
Argentina (Fryxell, 1997) and has one-seeded, dehiscent mericarps. Interestingly, the lower elevation perennial species of
Tarasa are more similar morphologically to Sphaeralcea,
while the high elevation annuals are more similar to Nototriche
(Tate and Simpson, 2003). Additional data will be needed to
define the boundaries of Tarasa and Nototriche or to determine if Nototriche should be considered a section of Tarasa.
Another finding in the ITS phylogeny related to Tarasa is
the placement of Urocarpidium albiflorum with Fuertesimalva
(Figs. 2, 4). This species, the type of the genus Urocarpidium,
was suggested to be synonymous with Tarasa operculata due
to its apically plumose awns on the mericarps (Fryxell, 1996).
The genus Fuertesimalva was created to accommodate the remaining species of Urocarpidium (Fryxell, 1996) that do not
possess this character. The results of the ITS phylogeny (and
also chloroplast data, Tate and Simpson, 2003), do not support
the separation of U. albiflorum from the remaining species of
Fuertesimalva, nor its inclusion in Tarasa and argue for the
original generic composition and name. Morphological characters that support the placement of U. albiflorum with Fuertesimalva rather than Tarasa include mericarps that are indehiscent, glabrous, and laterally ‘‘ridged’’ (vs. dehiscent, with
stellate pubescence on the dorsal and apical surfaces, and the
lateral walls that are smooth or faintly reticulate in Tarasa),
and calyx trichomes that are simple and hirsute (vs. stellate
stipitate in Tarasa). Thus, the occurrence of an apical awn on
the mericarps of U. albiflorum and Tarasa species appears to
be a convergent character, and we recognize the former as
separate from the latter.
Most included members of the Malacothamnus alliance (Iliamna, Malacothamnus, and Phymosia, excluding Neobrittonia, which is a member of clade A), form a clade in the ITS
phylogeny (Figs. 2, 4). However, Iliamna was also reconstructed as paraphyletic. Two species of Iliamna (n 5 33) (I.
bakeri and I. latibracteata) that are endemic to northern California/southern Oregon are more closely related to Sidalcea
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(n 5 10, 20, 30) and Eremalche (n 5 10, 20), which are
distributed along the western coast of North America, than to
the remaining members of Iliamna (Fig. 6). The other two
species included here (I. rivularis, found in the Rocky Mountains of the United States, and I. remota, found in Illinois,
Indiana, and Virginia), cluster with Phymosia umbellata (Mexico, Guatemala, and Caribbean) (n 5 17) and Malacothamnus
fasciculatus (California) (n 5 17). Morphologically, Iliamna
is distinct from Sidalcea and Eremalche. Characters distinguishing Iliamna from both genera include a perennial habit
(annual Eremalche, annual or perennial in Sidalcea), deciduous stipules (persistent in both Sidalcea and Eremalche), carpels with multiple seeds (single in Sidalcea and Eremalche),
and dehiscent mericarps (indehiscent in Eremalche). Chloroplast (rpl16 intron and trnL-F spacer) sequence data place Iliamna bakeri and I. latibracteata in a clade with other western
Iliamna species, while I. remota and I. corei are outside this
‘‘core’’ Iliamna clade with Phymosia (T. Bodo Slotta, unpublished data).
The Malvastrum alliance contains a single genus, Malvastrum, which, like Abutilon and Sida, was at one time a repository for many taxa that were difficult to place. Over the years,
however, several species were removed from the heterogeneous Malvastrum and placed in other genera, including Acaulimalva, Anisodontea, Malacothamnus, Monteiroa, Nototriche,
Sphaeralcea, Tarasa, and Urocarpidium (Fuertesimalva)
(Hill, 1982; Fryxell, 1997). Since Hill’s (1982) revision of
Malvastrum, the genus is a cohesive American taxon of 15
species that share a base chromosome number of x 5 6 (Fig.
6). Within the Malveae, Malvastrum appears to be rather isolated, but based on the ITS phylogeny, it is closely related to
other North (Eremalche, Sidalcea) or South (Calyculogygas,
Modiola, Modiolastrum, Monteiroa) American genera (Figs.
2, 4).
Like many of the other alliances in clade B, the Malope
alliance, comprised of Malope and Kitaibela, is not monophyletic. Previously, these two genera, along with Palaua
(Sphaeralcea alliance), were placed in a separate tribe Malopeae, because they shared the unique feature of multiverticillar
carpels (Table 1). All three are members of clade B, but are
not closely related to one another (Figs. 2, 4) , which suggests
that this unusual morphological feature has evolved on three
separate occasions. Bates (1968) placed Palaua in the Sphaeralcea alliance with the other x 5 5 genera, while retaining
Kitaibela and Malope as the sole members of the Malope alliance. He also proposed that the evolution of the carpels into
superposed verticils in Palaua occurred independently from
that of Malope and Kitaibela, a hypothesis supported here. In
the ITS phylogeny, Malope (n 5 22, 25) is included in a clade
(91% BS, 100% BPP) with some members of the Malva alliance (Lavatera, Malva, and Navaea), which share a geographic distribution in the Mediterranean region (Fig. 6). Kitaibela (n 5 21, 22) is sister to Alcea (n 5 13, 21) from the
Malva alliance (96% BS, 100% BPP); both of these genera
are found in the Mediterranean, East European, and West
Asian regions. Bates’ (1968) discussion of the Malva, Malope,
and Anisodontea alliances was included in the same section,
as he suspected their close relationship.
The Malva alliance (five genera, ;100 species), as alluded
to in the previous paragraph, is not monophyletic (Figs. 2, 4).
The genera of this alliance are found predominantly in the
Mediterranean/European region (although some Lavatera species occur in North America and Australia) and have various
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ET AL.—ITS PHYLOGENY OF TRIBE
multiples of an x 5 7 base chromosome number, which is
shared by most of the other closely related genera based on
the ITS data (Fig. 6). Lavatera, Malva, and Navaea phoenicea
form a strongly supported clade (94% BS, 100% BPP) with
Malope as its sister (Figs. 2, 4). Two species of Alcea cluster
together (100% BS, 100% BPP) and are sister to Napaea dioica. In a previous ITS phylogenetic study, Ray (1995) found
that the individual genera Malva and Lavatera were not monophyletic, but that the North American species of Lavatera were
more closely related to Malva than to the Old World Lavatera
species. Subsequently, the New World species of Lavatera
were transferred to Malva (Ray, 1998). The sister position of
Navaea with Lavatera and Malva is also supported by cpDNA
sequence data (Fuertes Aguilar et al., 2002). Morphological
groups (Lavateroid and Malvoid groups) were outlined by Ray
(1995), but clearly these two genera will require more extensive sampling of morphological and molecular data to sort out
their boundaries.
General conclusions—Tribe Malveae is a geographically,
chromosomally, and morphologically diverse clade. The ITS
phylogeny presented here shows that the current circumscription of the tribe into 14 generic alliances is artificial. Instead,
two clades can be defined by the presence or absence of involucral bracts, and, perhaps, only these two clades should be
named formally. Given the lack of support for many nodes at
the base of the tree, additional data (chloroplast and/or other
nuclear markers) are needed to corroborate these relationships.
Likewise, because many genera (and clades) contain polyploid
or aneuploid lineages, more data will likely give insight into
chromosome evolution, which already appears to have been
rather complex within the tribe. Moreover, determination of
the early-branching lineages of the Malveae should shed light
on the biogeographic origin of the tribe, which centers in the
Americas, but also contains South Pacific and European taxa,
and the base chromosome number for the tribe, which has been
postulated as x 5 8 or 9 (Bates, 1968).
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