Rubiaceae
Rothmannia

Rothmannia macrosiphon (K.Schum.) Bridson

First published in Kew Bull. 31: 180 (1976)
This species is accepted
The native range of this species is SE. Kenya to E. Tanzania. It is a shrub or tree and grows primarily in the seasonally dry tropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Rubiaceae, B. Verdcourt. Flora of Tropical East Africa. 1976

Morphology General Habit
Bush or small tree 1.8–7 m. tall; young stems glabrescent to finely velutinous.
Morphology Leaves
Leaf-blades oblanceolate to obovate, 4.5–14.4 cm. long, 2–6.8 cm. wide, apex acuminate, base cuneate, coriaceous, glabrous above, glabrous to glabrescent beneath with midrib sparsely pubescent; domatia absent; petioles 0.2–1.3 cm. long, sparsely pubescent; stipules triangular, acuminate, 3–5 mm. long, caducous.
Morphology Reproductive morphology Flowers
Flowers sweetly scented, solitary, terminal above a single leaf; peduncle 0.5–1.6 cm. long, pubescent, bearing 2–6 acute triangular bracteoles 2–6 mm. long.
Morphology Reproductive morphology Flowers Calyx
Calyx golden or reddish-brown pubescent; tube 10-grooved, 0.9–1.4 cm. long; limb-tube 0.4–1.1 cm. long, wider than the tube; lobes linear, 1.6–3.2 cm. long, 1.5–2 mm. wide, ± equal.
Morphology Reproductive morphology Flowers Corolla
Corolla white with reddish purple spots in throat, golden to buff pubescent outside when dry; tube long, narrowly cylindrical below, campanulate above, 11–24 cm. long, the campanulate part 3.8–6.2 cm. long, 3.1–4.5 cm. wide at top, 3–6 mm. wide at base, glabrous within, the cylindrical portion pubescent within; lobes overlapping to left in bud, ovate, 1.3–2.6 cm. long, (1.2–)1.8–3 cm. wide, rounded or obtuse, whitish tomentose above.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers well-included, 2–3 cm. long.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Style ± 11–18 cm. long, gradually widening to apex; stigma well-included, 2–3 cm. long, 3–4 mm. wide.
Morphology Reproductive morphology Fruits
Fruit ± ovoid, 2.5–3.2 cm. long, 2–2.2 cm. wide, not or sometimes slightly ribbed, golden pubescent, the calyx-limb and sometimes corolla persistent (perhaps not fully mature).
Morphology Reproductive morphology Seeds
Seeds not known.
Habitat
Forest; 60–450 m.
Distribution
K7 T3 T6 T8 not known elsewhere
[FTEA]

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/34871/9894804

Conservation
VU - vulnerable
[IUCN]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0