Vascular flora inventory and plant diversity
of the Ruvubu National Park, Burundi
Tatien MASHARABU
Marie Josée BIGENDAKO
Université du Burundi, Faculté des Sciences, Département de Biologie,
B.P. 2700 Bujumbura (Burundi)
tmashara@ulb.ac.be
Benoît NZIGIDAHERA
Institut national pour l’Environnement et la Conservation de la Nature (INECN),
B.P. 2757 Bujumbura (Burundi)
Balthazar MPAWENAYO
Université du Burundi, Faculté des Sciences, Département de Biologie,
B.P. 2700 Bujumbura (Burundi)
Jean LEJOLY
Université Libre de Bruxelles, Laboratoire d’écologie végétale et Biogéochimie,
case postale 244, boulevard du Triomphe, B-1050 Bruxelles (Belgium)
Frédéric BANGIRINAMA
école normale supérieure, Département des Sciences Naturelles,
B.P. 6983 Bujumbura (Burundi)
Jan BOGAERT
Université de Liège/Gembloux Agro-Bio Tech., Unité Biodiversité et Paysage,
2 passage des Déportés, B-5030 Gembloux (Belgium)
Masharabu T., Bigendako M. J., Nzigidahera B., Mpawenayo B., Lejoly J., Bangirinama
F. & Bogaert J. 2012. — Vascular flora inventory and plant diversity of the Ruvubu National
Park, Burundi. Adansonia, sér. 3, 34 (1): 155-162. http://dx.doi.org/10.5252/a2012n1a17
ADANSONIA, sér. 3 • 2012 • 34 (1) © Publications Scientifiques du Muséum national d’Histoire naturelle, Paris.
www.adansonia.com
155
Masharabu T. et al.
Key woRdS
Akagera,
Burundi,
floristic inventory,
plant richness,
Ruvubu.
ABSTRACT
The Ruvubu National Park, the biggest protected area and biodiversity refuge
of the country, is comparatively less studied than western Burundi near Bujum
bura, the capital. This article reports the results of a botanical inventory of the
vascular plants from the protected area, evidences species newly encountered
and establishes a comparison of the floristic diversity with the Akagera National
Park in Rwanda located in the same phytochorion, in the Lake Victoria regional
mosaic. Records from the Ruvubu include 522 species (including infraspecific
groups) from 96 families and 306 genera, representing nearly 17% of the known
vascular plants of Burundi. The most common families were the Fabaceae, the
Asteraceae and the Poaceae. 96 species or 18% of the flora were encountered for
the first time in the park. Study of environmental determinants of Leguminosae
abundance and floristic variability would provide more precisions.
MoTS CléS
Akagera,
Burundi,
inventaire floristique,
richesse floristique,
Ruvubu.
RéSUMé
Inventaire de la flore vasculaire et diversité floristique du Parc national de la
Ruvubu, Burundi
Comparé au Burundi occidental proche de Bujumbura, la capitale, le Parc
national de la Ruvubu, la plus grande aire protégée, refuge de la biodiversité
du pays, a été relativement peu étudiée. Cette étude rapporte les résultats d’un
inventaire botanique des plantes vasculaires de l’aire protégée, met en relief les
espèces nouvellement signalées dans le parc et établit une comparaison de la
diversité floristique avec le Parc national de l’Akagera au Rwanda, localisé dans
la même phytochorie, dans la mosaïque régionale du lac Victoria. La richesse
spécifique de la Ruvubu fait état de 522 espèces (incluant les groupes infra
spécifiques) réparties en 96 familles et 306 genres représentant près de 17 %
des plantes vasculaires connues du Burundi. Les familles les plus nombreuses
sont les Fabaceae, les Asteraceae et les Poaceae. 96 espèces (18 %) de la flore
sont signalées pour la première fois dans le parc. L’étude des déterminants envi
ronnementaux de l’abondance des légumineuses et de la variabilité floristique
pourrait fournir de plus amples précisions.
INTRODUCTION
Many studies (Lewalle 1972; Ndabaneze 1983;
Bigendako 1989; Bizuru 2005) have reported that
Burundi shelters several plant species on a reduced
size. It is quite remarkable that western Burundi, not
far from the capital Bujumbura, was more studied
in relation to other remaining parts of the country.
According to Bizuru (2005), areas corresponding
currently to national parks and different other pro
tected areas of Burundi have been until now very
little studied. On the whole protected sites of East
Africa, the Ruvubu National Park (RNP), the biggest
protected area of Burundi with 50 800 ha, occupies
a particular position. Although it does not shelter
probably any species that does not exist elsewhere,
156
it has an interest that goes over burundian borders
since it is about a rare evidence of the transition
between dense forest and humid savannas. It rep
resents the unique protected sample of the humid
savanna ecosystem with Parinari-Pericopsis (Vande
Weghe & Kabayanda 1992). This study carries on a
botanical inventory conducted in the RNP, sanctuary
and shelter of large mammals disappeared elsewhere
in the country. Nzigidahera (2000) underlined
indeed that the vegetation of the RNP remains
little known in its whole. Masharabu et al. (2008)
observe that little study have been conducted and
data related to its floristic composition are lacking
either insufficient. In a context of good manage
ment, planning and biodiversity conservation, it is
important to keep a better knowledge of its flora
ADANSONIA, sér. 3 • 2012 • 34 (1)
and that requires proceeding to a plant resource
assessment. Therefore, in order to reinforce a deci
sion making of animal communities conservation
and sustainable management of the protected area
system, it is important to get a better knowledge of
the botanical diversity (Lubini 1982; Laurance et
al. 2006). The entire species list for the RNP has
been published by Masharabu et al. (2010). The
present paper provides an inventory of the RNP
vascular flora (Pteridophytes and Phanerophytes)
and highlights species newly encountered in the
park. This paper is the first to provide an inventory
of plant species as complete as possible in a given
protected site of Burundi. The study hypothesis was
that plant diversity in RNP and Akagera National
Park (ANP) in Rwanda would be similar due to their
biogeographical location at the crossroads of several
biogeographical influences in the Lake Victoria re
gional mosaic. This region is the meeting place of
five regional floras: GuineoCongolian, Sudanian,
Zambezian, SomaliaMasai and Afromontane. Its
vegetation is a mosaic of floristically impoverished
variants of the first four plus some communities
which are transitional between Afromontane and
lowland vegetation (White 1993).
MATERIAL AND METHODS
This study was carried out in the RNP using a
botanical inventory in 114 vegetation plots vary
ing between 100 and 900 m2. The inventory was
conducted from December 2005 until June 2009,
intermittently. The park is located in the north
eastern Burundi (Fig. 1) between latitudes 2°54’
3°22’S and longitudes 30°6’30°33’E, and covers
an area of 50 800 ha. The altitude ranges from
1350 to 1836 m (Vande Weghe & Kabayanda
1992). According to Köppen classification, it has
a tropical climate classified as (AW3)s. The main
vegetation features are made of savannas, riparian
forests and swamps. Duplicates of plant material
were deposited at the Herbarium of the Université
Libre de Bruxelles (BRLU), as well as at the Her
barium of the University of Burundi (BJA). The
systematic determination and verification were
conducted at BJA and BRLU Herbaria as well as at
the Herbarium of the National Botanic Garden of
Belgium (BR) at Meise by comparison of herbarium
ADANSONIA, sér. 3 • 2012 • 34 (1)
DEMOCRATIC REPUBLIC OF CONGO
Vascular flora inventory and plant diversity of the Ruvubu National Park, Burundi
2
RWANDA
TANZANIA
1
BURUNDI
N
100 km
Fig. 1. — Location of the Ruvubu National Park (1) in Burundi and
Akagera National Park (2) in Rwanda.
specimens and by the help of literature and special
ists. The main bibliographic references consulted
during taxa identification are: Blundell (1987) and
Troupin (1971, 1978, 1982, 1983, 1985, 1988).
Nomenclature follows Roux (2009) for ferns and
Lebrun & Stork (19911997) for flowering plants.
The names of flowering plants were checked in
African Flowering Plants Database (AFPD) avail
able online at http://www.villege.ch/musinfo/
bd/cjb/africa/recherche.php. In order to provide a
floristic inventory more complete as possible, our
inventory was also partially completed by specific
literature citations referring to the protected area
(Ndabaneze 1989; Vande Weghe & Kabayanda
1992; Nzigidahera 2000). These documents pro
duced at University of Burundi and at the National
(Burundi) Institute for Environment and Nature
Conservation (INECN) in different research ac
tivities were consulted in order to evidence species
newly encountered in the protected area. The main
richest families from ANP were sorted through
Troupin (1966) inventory. ChiSquare test (Scher
rer 2007) was performed to test whether within
the main richest families with at least 15 species
each one, the numbers of species and genera from
the two parks differ significantly.
157
Masharabu T. et al.
Table 1. — Taxonomic composition of the Ruvubu National Park, Burundi.
Family
DICOTS
Acanthaceae
Amaranthaceae
Anacardiaceae
Annonaceae
Apiaceae
Apocynaceae
Araliaceae
Asteraceae
Balsaminaceae
Bignoniaceae
Bombacaceae
Boraginaceae
Caesalpiniaceae
Celastraceae
Chrysobalanaceae
Clusiaceae
Combretaceae
Convolvulaceae
Cucurbitaceae
Euphorbiaceae
Fabaceae
Flacourtiaceae
Gentianaceae
Lamiaceae
Leeaceae
Loranthaceae
Malvaceae
Melastomataceae
Meliaceae
Melianthaceae
Menispermaceae
Mimosaceae
Monimiaceae
Moraceae
Myristicaceae
MONOCOTS
Agavaceae
Amaryllidaceae
Anthericaceae
Arecaceae
Asparagaceae
Asphodelaceae
Balanophoraceae
Colchicaceae
Commelinaceae
Cyperaceae
PTERIDOPHYES
Cyatheaceae
Dennstaedtiaceae
Dryopteridaceae
158
Genera Species
Subspecies/
Varieties Family
Genera
Species
Subspecies/
Varieties
11
4
4
3
5
10
1
32
1
3
1
2
3
1
2
3
2
3
2
14
22
1
1
12
1
2
5
3
2
1
3
5
1
1
1
16
4
7
3
5
11
1
57
1
3
1
2
6
4
2
3
4
7
3
26
59
1
2
16
1
2
11
7
2
1
3
8
1
10
1
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
5
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Myrsinaceae
Myrtaceae
Nymphaeaceae
Ochnaceae
Olacaceae
Oleaceae
Onagraceae
Opiliaceae
Oxalidaceae
Passifloraceae
Pedaliaceae
Phytolaccaceae
Pittosporaceae
Polygalaceae
Polygonaceae
Primulaceae
Proteaceae
Ranunculaceae
Rhamnaceae
Rhizophoraceae
Rosaceae
Rubiaceae
Rutaceae
Sapindaceae
Sapotaceae
Scrophulariaceae
Strychnaceae
Solanaceae
Sterculiaceae
Thymeleaceae
Tiliaceae
Ulmaceae
Urticaceae
Verbenaceae
Vitaceae
1
2
1
1
2
2
1
1
2
1
1
1
1
2
2
1
2
1
2
1
1
19
1
4
1
2
1
1
2
1
1
2
2
3
4
2
4
2
2
2
2
2
1
3
1
2
1
1
2
4
1
4
3
2
1
1
28
1
4
1
2
4
7
2
3
4
2
2
7
9
2
1
–
–
1
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
3
–
–
–
–
1
–
–
–
–
–
1
–
1
2
1
1
1
3
1
1
3
6
1
2
2
1
2
3
1
1
5
15
–
–
–
–
–
–
2
–
–
–
Dioscoreaceae
Dracaenaceae
Hyacinthaceae
Hypoxidaceae
Iridaceae
Orchidaceae
Poaceae
Smilacaceae
Xyridaceae
Zingiberaceae
1
1
1
1
2
2
26
1
1
2
6
1
1
1
3
2
52
1
1
3
–
–
–
–
–
–
–
–
–
–
1
2
1
3
2
1
–
–
–
Nephrolepidaceae
Osmundaceae
Pteridaceae
1
1
1
1
1
1
–
–
–
ADANSONIA, sér. 3 • 2012 • 34 (1)
Vascular flora inventory and plant diversity of the Ruvubu National Park, Burundi
RESULTS
The floristic richness of the RNP comprises 522 spe
cies (including infraspecific groups) distributed into
96 families and 306 genera (Table 1). In total, Dicots
are better represented with 78% of the whole spe
cies. Monocots represent 20% while Pteridophytes
represent only 2% of the flora. The eight following
families record over a half (51%) of the whole spe
cies from RNP: Fabaceae (59 species), Asteraceae (57
species), Poaceae (52 species), Rubiaceae (28 species),
Euphorbiaceae (26 species), Acanthaceae (16 species),
Lamiaceae (16 species) and Cyperaceae (15 species).
Table 2 establishes a comparison of floristic richness
of families recording at least 15 species each one in
RNP and ANP, relatively closer and belonging to
the same phytochorion in the Lake Victoria regional
mosaic according to White (1993).
96 species (18%) were encountered for the first time
in the RNP with predominance of Fabaceae (23%
of the newly encountered species). The inventory of
species newly encountered in the RNP is as follows:
Acanthaceae. Hypoestes verticillaris (L.f.) Sol. ex
Roem. & Schult., Thunbergia alata Bojer ex Sims.
Amaranthaceae. Alternanthera pungens Kunth.
Convolvulaceae. Dichondra repens J.R.Forst. & G.
Forst., Hewittia sublobata (L.f.) Kuntze.
Cucurbitaceae. Zehneria thwaitesii (Schweinf.)
C.Jeffrey.
Cyperaceae. Kyllinga sphaerocephala Boeckeler,
Mariscus macrocarpus Kunth.
dennstaedtiaceae. Histiopteris incise (Thunb.) J. Sm.
dioscoreaceae. Dioscorea alata L., Dioscorea bulbifera L., Dioscorea odoratissima Pax.
euphorbiaceae. Acalypha ornata Hochst. ex A.Rich.,
Clutia abyssinica Jaub. & Spach, Croton macrostachyus
Hochst. ex Delile, Phyllanthus niruri L., Synadenium
grantii Hook.f., Tragia brevipes Pax.
Fabaceae. Crotalaria aculeata De Wild., Crotalaria lachnophora A.Rich., Crotalaria ononoides Benth.,
Crotalaria sp., Desmodium salicifolium (Poir.) DC.,
Desmodium setigerum (E.Mey.) Benth. ex Harv.,
Desmodium triflorum (L.) DC., Desmodium velutinum (Willd.) DC., Eriosema chrysadenium Taub.,
Eriosema rhodesicum R.E.Fr., Eriosema stanerianum
Hauman, Indigofera emarginella Steud. ex A.Rich.,
Indigofera homblei Baker f. & Martin, Indigofera paracapitata J.B.Gillett, Indigofera rhynchocarpa Welw.
ex Baker, Indigofera spicata Forssk., Indigofera zenkeri
Harms ex Baker f., Rhynchosia sublobata (Schumach.
& Thonn.) Meikle, Tephrosia linearis (Willd.) Pers.,
Teramnus labialis (L.f.) Spreng., Vigna luteola (Jacq.)
Benth., Vigna parkeri Baker.
Asteraceae. Bidens steppia (Steetz) Sherff, Cirsium buchwaldii O.Hoffm., Crassocephalum multicorymbosum (Klatt) S.Moore, Crassocephalum rubens
(Juss. ex Jacq.) S.Moore, Crassocephalum sarcobasis
(DC.) S.Moore, Erlangea cordifolia (Benth. ex
Oliv.) S.Moore, Helichrysum keilii Moeser, Pleiotaxis
pulcherrima Steetz, Vernonia fontinalis S.Moore,
Vernonia lasiopus O.Hoffm., Vernonia ugandensis
S.Moore.
lamiaceae. Leucas calostachya Oliv., Solenostemon
platostomoides (Robyns & Lebrun) Troupin.
Boraginaceae. Cordia africana Lam., Trichodesma
zeylanicum (Burm.f.) R.Br.
Malvaceae. Hibiscus aponeurus Sprague & Hutch.,
Sida cordifolia L.
Caesalpiniaceae. Cassia kirkii Oliv., Cassia mimosoides L., Cassia siamea Lam.
Melastomataceae. Antherotoma naudinii Hook.f.,
Dissotis brazzae Cogn., Dissotis ruandensis Engl.,
Dissotis senegambiensis (Guill. & Perr.) Triana, Dissotis trothae Gilg, Tristemma incompletum R.Br.
Commelinaceae. Commelina benghalensis L., Commelina diffusa Burm.f. subsp. diffusa, Floscopa africana (P.Beauv.) C.B.Clarke.
ADANSONIA, sér. 3 • 2012 • 34 (1)
Mimosaceae. Acacia sieberiana DC.
159
Masharabu T. et al.
Moraceae. Ficus ovata Vahl.
osmundaceae. Osmunda regalis L.
Poaceae. Hyparrhenia cymbaria (L.) Stapf, Hyparrhenia newtonii (Hack.) Stapf, Hyparrhenia rufa (Nees)
Stapf, Loudetia kagerensis (K.Schum.) C.E.Hubb.
ex Hutch., Oplismenus compositus (L.) P.Beauv.,
Pennisetum polystachion (L.) Schult., Setaria kagerensis Mez, Setaria pumila (Poir.) Roem. & Schult.,
Urelytrum digitatum K.Schum.
Polygonaceae. Rumex usambarensis (Dammer)
Dammer.
Rubiaceae. Agathisanthemum globosum (Hochst.
ex A.Rich.) Bremek., Fadogia obovata Schweinf.,
Hymenodictyon floribundum (Hochst. & Steud.)
Robbr., Pavetta ternifolia (Oliv.) Hiern, Spermacoce dibrachiata Oliv., Spermacoce sphaerostigma
(A.Rich.) Vatke.
Scrophulariaceae. Buchnera keilii Mildbr., Lindernia sp.
Solanaceae. Solanum anguivi Lam.
Thymeleaceae. Gnidia ericoides C.H.Wright.
Tiliaceae. Triumfetta cordifolia A.Rich.
Urticaceae. Urtica massaica Mildbr.
Vitaceae. Rhoicissus tridentata (L.f.) Wild &
R.B.Drumm.
Xyridaceae. Xyris capensis Thunb.
DISCUSSION
The 522 taxa recorded from the RNP represent
17% of the vascular plant species so far estimated
for Burundi and 17% of the flora recorded in the
Lake Victoria regional mosaic. The vascular plants
are estimated at about more than 3000 species for
Burundi (Ndabaneze 1989) and 3000 species in
160
the Lake Victoria regional mosaic (White 1993).
Ferns are weakly represented in the PNR (nine
species distributed into six families) and it is not
strange as the RNP is mainly made of savannas.
Moreover, it is wellknown that the Pteridophytes
diversity in Africa is exceptionally poor (Tryon
1986; Roux 2009). Burundi comprises 32 fami
lies of Pteridophytes distributed into 69 genera
and 178 species (Roux 2009). Therefore, the
Pteridophytes of the RNP represent 5% of those
of the whole country.
The flora of the RNP represents besides 5% of
the flora of Central Africa (Burundi, Democratic
Republic of Congo and Rwanda). According to
Brenan (1978), floristic richness of the Cen
tral Africa region is estimated at more or less
10 000 species. According to Léonard (1994),
spermatophytes’ statistics of the flora of Central
Africa include 9377 species. Burundi (27 834
km2) being confined between Eastern and Cen
tral Africa (Bidou et al. 1991), the RNP floristic
richness represents about 4.8% of the flora of
Eastern Africa which is estimated according to
Linder (2001), at 11 000 species.
The plant communities of the RNP present rela
tively a poor taxonomic diversity when compared
with tropical forests. In the humid tropical forests,
flowering plants are estimated at 7146 species in
the Guianas (Guyana, Suriname, French Guiana)
according to Haripersaud et al. (2010), 4300 species
in French Guiana (90 000 km2) and 8000 species
in Peninsular Malaysia (130 000 km2) according
to Blanc (1997). The tropical forests record the
largest known specific diversity and also shelter
numerous even unknown species, because inven
tories are far to be finished there (Puig 2001).
Families with the greatest number of species
in RNP and ANP are not statistically different
in terms of species richness as well as for genera
richness (p>0.05). It was hypothesized that plant
diversity in RNP and ANP in Rwanda would be
similar due to their biogeographical location at
the crossroads of several biogeographical influ
ences in the Lake Victoria regional mosaic. The
hypothesis is accepted for species and generic
richness within families in the two protected
areas. However, even if they are not statistically
ADANSONIA, sér. 3 • 2012 • 34 (1)
Vascular flora inventory and plant diversity of the Ruvubu National Park, Burundi
Table 2. — Comparison of the floristic richness of families with at least 15 species each one in Ruvubu National Park with their correspondences from Troupin (1966) in Akagera National Park (species: ddl = 7, c2 = 9.98, p > 0.05; genera: ddl = 7, c2 = 2.63, p > 0.05).
Families
Fabaceae
Asteraceae
Poaceae
Rubiaceae
Euphorbiaceae
Acanthaceae
Lamiaceae
Cyperaceae
Ruvubu National Park, Burundi
species
genera
observed expected observed expected
59
57
52
28
26
16
16
15
51
59
61
23
21
19
16
19
22
32
26
19
14
11
12
6
different, the numeric gap in observed species and
generic richness would be due to the fact that the
ANP includes xerophytic groves and xerophytic
forests not found in Ruvubu, while wetlands
spread on 50% of the total area. The current
size of the ANP has been fixed at 108 500 ha in
1997 after an encroachment of practically ⅔ of
the total area with negative effects on biodiversity
(Buda et al. 2005).
The Fabaceae family has the greatest number of
species in RNP. It is also the third biggest family
of flowering plants worldwide after Orchids and
Asteraceae (Mabberley 1997; Lewis et al. 2005).
Fabaceae and Asteraceae are basically the first
predominant families in Central Africa (Burundi,
Democratic Republic of Congo and Rwanda)
in terms of species richness listed by Léonard
(1994). Particularly, according to Rundel (1989),
Arianoutsou & Thanos (1996), the Leguminosae
taxa (Fabaceae, Caesalpiniaceae & Mimosaceae) are
ecologically very successful in terms of dominance
and productivity. Leguminosae, through their
symbiotic abilities to fix atmospheric nitrogen,
have adaptations to establish on soils with lim
ited nitrogen availability and play an important
role in colonizing disturbed ecosystem, including
those that are fire prone (Arianoutsou & Thanos
1996), of which the RNP. That would justify
partially their abundance in the RNP and within
the newly encountered species. Nevertheless, the
study of environmental determinants of Legumi
nosae abundance and floristic variability would
provide more precisions.
ADANSONIA, sér. 3 • 2012 • 34 (1)
21
33
30
17
12
12
11
5
Akagera National Park, Rwanda
species
genera
observed expected observed expected
65
85
95
28
25
29
23
31
73
83
86
33
30
26
23
27
24
39
40
19
13
16
12
5
25
38
36
21
15
15
13
6
Acknowledgements
Authors are grateful to the Government of Burundi
for its support as well as to the INECN staff based
at the surroundings of the RNP for field assistance.
Many thanks to the staff of the National Botanic
Garden of Belgium at Meise, particularly to the
Engineer Luc Pauwels who helped to identify the
Poaceae and to Daniel Geerinck who provided con
viviality to the first author for accessing to Meise.
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