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This species is accepted, and its native range is W. Tropical Africa to NW. Tanzania.
A specimen from Kew's Herbarium

[FTEA]

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

Type
Type: Tanzania, Bukoba District: Bukoba, Watkins 526 (K!, holo.)
Morphology General Habit
Robust, rhizomatous perennial.
Morphology Culms
Culms lateral, 24–50 cm long, compressed-terete, 1–2 mm wide, smooth to slightly scabrid in upper part
Morphology Leaves
Leaves all basal, coriaceous, linear, 30–80 × 1–1.7 cm, gradually narrowed, acute, flat or slightly plicate, margins entire to serrulate.
Morphology Leaves Leaf sheaths
Sheath 6.5–8 cm long, 0.7–1 cm wide (when flattened), membranous margins dark brown
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, linear, 2.8–3.5 × 0.1–0.2 cm, acute
Morphology Reproductive morphology Inflorescences
Inflorescence stiffly erect, paniculate, comprising up to 4 primary branches 1–3.2 cm long, each subtending 2–7 (rarely more) subsessile spikes. Spikes mid-brown, linear-ellipsoid when young to ellipsoid when in fruit, 0.8–1.3 cm long, 1–2(–4 in fruit) mm wide
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers white, oblong, 0.5–0.8 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1.8–3 mm long
Morphology Reproductive morphology Flowers Gynoecium Style
Style 1.3 mm long (including stigma branches)
Morphology Reproductive morphology Fruits
Fruit compressed-ellipsoid, 2.3–2.8 mm long, 1.2–1.4 mm wide, base shortly stipitate, apical portion triangular, acute, surface pale brown with indistinct longitudinal ridges.
Morphology Leaves Leaf veins
Lateral costae absent
Figures
Fig. 1, p7
Ecology
Swamp forest, in permanently waterlogged situations; 1100–1200 m
Distribution
Range: Widespread in forest areas from Guinea to Congo-Kinshasa Flora districts: U4 T1

[FWTA]

Cyperaceae, Miss S. S. Hooper. Flora of West Tropical Africa 3:2. 1972

Diagnostic
Differs from all the W. African Hypolytum species in the flowering spikes being several times longer than broad
Ecology
On wet rocks and other damp places in forest.

Native to:

Cabinda, Cameroon, Central African Repu, Equatorial Guinea, Gabon, Ghana, Guinea, Gulf of Guinea Is., Ivory Coast, Liberia, Nigeria, Senegal, Sierra Leone, Tanzania, Uganda, Zaïre

Hypolytrum heteromorphum Nelmes appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Sep 1, 2010 Cheek, M. [11938], Cameroon K000673390
Sep 1, 2010 Etuge, M. [5175], Cameroon K000673389
Jul 1, 2007 Tchiengue, B. [2820], Cameroon K000436221
May 1, 2001 Etuge, M. [4183], Cameroon K000050915
May 1, 2001 Etuge, M. [4450], Cameroon K000050916
Watkins, G. [526], Tanzania K000244880 holotype

First published in Kew Bull. 9: 522 (1954 publ. 1955)

Accepted by

  • Cabezas, F., Aedo, C. & Velayos, M. (2004). Checklist of the Cyperaceae of Equatorial Guinea (Annobón, Bioko, Río Muni) Belgian Journal of Botany 137: 3-26.
  • Figueiredo, E. & Smith, G.F. (2008). Plants of Angola Strelitzia 22: 1-279. National Botanical Institute, Pretoria.
  • Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Govaerts, R. (2004). World Checklist of Monocotyledons Database in ACCESS: 1-54382. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466.
  • Lejoy, J., Ndjele, M.-B. & Geerinck, D. (2010). Catalogue-flore des plantes vasculaires des districts de Kisangani et de la Tshopo (RD Congo) Taxonomania. Revue de Taxonomie et de Nomenclature Botaniques 30: 1-307.
  • Sosef, M.S.M. & al. (2006). Check-list des plantes vasculaires du Gabon Scripta Botanica Belgica 35: 1-438.
  • Velayos, M., Aedo, C., Cabezas, F., de la Estrella, M., Barberá, P. & Fero, M. (eds.) (2014). Flora de Guinea Ecuatorial 11: 1-416. Consejo superior de investigaciones científicas, Real jardín botánico, Madrid.

Literature

Flora of West Tropical Africa

  • in Kew Bull. 9: 522 (1955).

Kew Backbone Distributions

  • Cabezas, F., Aedo, C. & Velayos, M. (2004). Checklist of the Cyperaceae of Equatorial Guinea (Annobón, Bioko, Río Muni) Belgian Journal of Botany 137: 3-26.
  • Sosef, M.S.M. & al. (2006). Check-list des plantes vasculaires du Gabon Scripta Botanica Belgica 35: 1-438.

Flora of Tropical East Africa

  • Haines & Lye, Sedges & Rushes E. Afr.: 326, fig. 669 (1983).
  • K.B. 1954: 522 (1955)

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

Flora of West Tropical Africa
Flora of West Tropical 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 Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0