Cyperaceae
Bulbostylis

Bulbostylis ugandensis (Lye) R.W.Haines

First published in R.W.Haines & K.A.Lye, Sedges & Rushes E. Afr., App. 3: 1 (1983)
This species is accepted
The native range of this species is Uganda to Burundi and NW. Tanzania. It is an annual or perennial and grows primarily in the seasonally dry tropical biome.

Descriptions

Cyperaceae, K Hoenselaar, B. Verdcourt & H. Beentje. Hypolytrum, D Simpson. Fuirena, M Muasya. Flora of Tropical East Africa. 2010

Type
Type: Uganda, Mengo District: Entebbe, Lye 684 (MHU, holo.; K!, iso.)
Morphology General Habit
Rather densely tufted annual or perennial 5–40(–50) cm tall.
Morphology Stem
Stems 0.3–0.5 mm thick, glabrous save for some scattered spine-like hairs beneath the inflorescence
Morphology Leaves
Leaves 5–20 cm long, 0.3–0.7 mm wide, with short spine-like hairs on the ridges; throat hairs of the sheaths up to 1 cm long
Morphology Reproductive morphology Inflorescences
Inflorescence a compact head of 3–10 sessile spikelets; main bract 3–12 mm long, with long hairs.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets 4–5(–8) mm long, 2–3 mm wide, obtuse.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reddish brown with usually green 3-veined midrib, 1.5–2 mm long, glabrous or pubescent, ciliate at margin, obtuse or emarginate at the apex
Morphology Reproductive morphology Fruits
Nutlet obovoid, 0.8 mm long, 0.5–0.6 mm wide, with many very distinct longitudinal ribs and many narrow horizontal interconnecting ribs.
Morphology Reproductive morphology Flowers Gynoecium Style
Style-base persistent on the nutlet.
Ecology
" Loudetia, Andropogon and Eragrostis grassland over laterite ironstone platforms, in waterlogged sandy soil, by rock pools, on rock outcrops, forest margins (in T 1), swamps; 1100–1650 m
Note
" Verdcourt 3369 (Buha District: Kasakela reserve, 18 Nov. 1962, on strand ± 6 m behind high tide) may be a very young stage of this species and would add T 4 to the distribution.
Distribution
Flora districts: U3 U4 K5 T1 Range: Rwanda, Burundi
[FTEA]

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]

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/

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. 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 2026. 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