1. Family: Poaceae Barnhart
    1. Genus: Cenchrus L.
      1. Cenchrus trachyphyllus (Pilg.) Morrone

        This species is accepted, and its native range is Cameroon to Ethiopia and Tanzania.

    [GB]
    Habit
    Perennial. Culms decumbent, or rambling; 60-200 cm long; rooting from lower nodes. Culm-nodes black. Ligule a fringe of hairs. Leaf-blades linear, or lanceolate; 10-45 cm long; 8-30 mm wide; membranous.
    Inflorescences
    Synflorescence compound; scanty. Inflorescence a panicle; terminal and axillary. Panicle spiciform; linear; 10-25 cm long. Primary panicle branches accrescent to a central axis; with sessile scars on axis. Panicle axis with rounded ribs; scaberulous; glabrous; bearing deciduous spikelet clusters. Spikelets subtended by an involucre. Fertile spikelets sessile; 1-3 in the cluster. Involucre composed of bristles; oblong; 5-9 mm long; base obtuse, or bluntly stipitate (indistinctly). Involucral bristles deciduous with the fertile spikelets; numerous; 15-30 in principal whorl; with one conspicuously longer bristle; 10-30 mm long; terete; flexible; glabrous.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; acute, or acuminate; 4-7 mm long; falling entire; deciduous with accessory branch structures.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; acute, or acuminate; 4-7 mm long; falling entire; deciduous with accessory branch structures.
    Glume
    Glumes dissimilar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; 0.1-0.25 length of spikelet; hyaline; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume oblong; 0.25-0.5 length of spikelet; membranous; without keels; 3-5 -veined. Upper glume apex acuminate.
    Florets
    Basal sterile florets male, or barren; with palea, or without significant palea. Lemma of lower sterile floret ovate; 1 length of spikelet; membranous; 5-7 -veined; scaberulous; acuminate. Palea of lower sterile floret scabrous; adorned on keels. Fertile lemma ovate; 4-7 mm long; chartaceous; without keel; 5 -veined. Lemma surface scaberulous. Lemma margins flat. Lemma apex acute, or acuminate. Palea chartaceous.
    Flowers
    Lodicules absent. Anthers 3; 2-3 mm long; anther tip smooth.
    Fruits
    Caryopsis with adherent pericarp; oblong; dorsally compressed; 2.5 mm long.
    Distribution
    Africa: west-central tropical, northeast tropical, and east tropical.
    Reference
    Paniceae. FTEA.
    [FWTA]

    Gramineae, W. D. Clayton. Flora of West Tropical Africa 3:2. 1972

    Habit
    Perennial up to 2 m. high.
    [FTEA]

    Gramineae, W. D. Clayton, S. M. Phillips & S. A. Renvoize. Flora of Tropical East Africa. 1974

    Habit
    Perennial; culms 60–200 cm. high, ascending and rooting at the nodes, sometimes scrambling, the nodes black.
    Leaves
    Leaf-blades linear-lanceolate, mostly 10–45 cm. long, 8–30 mm. wide, thin.
    Inflorescences
    Panicles linear, 10–25 cm. long, moderately lax, occasionally with slender side branches at the base, terminal and axillary forming a sparse false panicle; rhachis with rounded ribs bearing indistinct flat or oblique stumpless scars of fallen involucres, scaberulous; involucre enclosing 1–3 sessile spikelets, composed of 15–30 bristles with a very short indistinct stipe; bristles glabrous, the longest 10–30 mm.
    Spikelets
    Spikelets lanceolate, 4–7 mm. long; lower glume up to 1/4 the length of the spikelet, the upper glume 1/4–1/2; lemmas equalling the spikelet, the lower ♂ or barren, the upper firmer in texture and minutely scaberulous above.
    Habitat
    Pathsides and glades in semi-shade of rain-forest or dry evergreen forest, favouring moist soils; 1000–2500 m.
    Distribution
    K1 K3 K4 K5 K6 T2 T3 T5 T6 T7 U2 U3

    Images

    Distribution

    Native to:

    Burundi, Cameroon, Ethiopia, Kenya, Rwanda, Sudan, Tanzania, Uganda, Zaïre

    Cenchrus trachyphyllus (Pilg.) Morrone appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    May 1, 1932 Ross, F.J. [166], Tanzania Pennisetum trachyphyllum K000281229
    Holst, C. [3253], Tanzania Pennisetum trachyphyllum K000281228 isosyntype

    First published in Ann. Bot. (Oxford) 106: 129 (2010)

    Literature

    Kew Backbone Distributions
    • Hedberg, I. & Edwards, S. (eds.) (1995). Flora of Ethiopia and Eritrea 7: 1-430. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.
    • Ndabaneze, P. (1989). Catalogue des Graminées du Burundi Lejeunia; Revue de Botanique, n.s., 132: 1-127.
    • Troupin, G. (ed.) (1988). Flora du Rwanda 4: I-X, 1-651. Musee Royal de l'Afrique Centrale.
    • Clayton, W.D. & Renvoize, S.A. (1982). Gramineae Flora of Tropical East Africa 3: 451-898.
    • Hepper, F.N. (ed.) (1972). Flora of West Tropical Africa, ed. 2, 3(2): 277-574.

    Sources

    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

    GrassBase - The Online World Grass Flora
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    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 2019. 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 2019. 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