Cenchrus ramosus (Hochst.) Morrone

First published in Ann. Bot. (Oxford) 106: 129 (2010)
This species is accepted
The native range of this species is Nigeria to Eritrea and Tanzania. It is an annual and grows primarily in the seasonally dry tropical biome.

Descriptions

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/117008498/117008501

Conservation
LC - least concern
[IUCN]

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

Morphology General Habit
Tough caespitose annual; culms 50–200 cm. high, erect.
Morphology Leaves
Leaf-blades flat or folded, 6–30 cm. long, 4–18 mm. wide, with a blunt tip; sheaths keeled.
Morphology Reproductive morphology Inflorescences
Panicle linear to narrowly oblong, 2–7 cm. long, compact, bristly, the culm scabrid below the panicle; rhachis with sharp decurrent wings below the closely spaced cupular scars, scaberulous; involucre enclosing 1 sessile spikelet, truncate at the base, the single whorl of bristles briefly connate there; bristles glabrous, the longest 10–30 mm.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets narrowly ovate to ovate, 5–6.5 mm. long; lower glume small, up to 1 mm.; upper glume 4/5 to as long as the spikelet, the lower lemma similar, ♂ or barren; upper lemma coriaceous, acuminate to acuminate-aristate.
Habitat
Swampy places, particularly on black clays; 500–1500 m.
Distribution
T1 T4 T5 T6 T7 T8 U1 U3
[FTEA]

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

Morphology General Habit
Annual, up to 1·2 m. high
Ecology
On seasonally swampy heavy soils.
[FWTA]

Morphology General Habit
Annual; caespitose. Culms erect; 50-200 cm long. Ligule a fringe of hairs. Leaf-blades flat, or conduplicate; 6-30 cm long; 4-18 mm wide. Leaf-blade apex abruptly acute.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Peduncle antrorsely scabrous above. Panicle spiciform; linear, or oblong; 2-7 cm long. Primary panicle branches accrescent to a central axis; with sessile scars on axis. Panicle axis with briefly decurrent ribs; scaberulous; glabrous; bearing deciduous spikelet clusters. Spikelets subtended by an involucre. Fertile spikelets sessile; 1 in the cluster. Involucre composed of bristles; connate into a disc below (slightly); oblong; 5-20 mm long; base truncate. Involucral bristles deciduous with the fertile spikelets; numerous; in one whorl; 12-24 in principal whorl; with one conspicuously longer bristle; 10-30 mm long; terete; rigid; glabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 5-6.5 mm long; falling entire; deciduous with accessory branch structures.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 5-6.5 mm long; falling entire; deciduous with accessory branch structures.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes dissimilar; reaching apex of florets, or shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.1-0.15 length of spikelet; hyaline; without keels; 0-1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume ovate; 0.8-1 length of spikelet; membranous; without keels; 7-9 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret ovate; 0.8-1 length of spikelet; membranous; 5 -veined; acute. Fertile lemma ovate; 5-6.5 mm long; coriaceous; without keel; 5 -veined. Lemma margins flat. Lemma apex acute. Palea coriaceous.
Morphology Reproductive morphology Flowers
Lodicules absent. Anthers 3; 1.5-2.5 mm long; anther tip smooth. Styles free to the base.
Distribution
Africa: west tropical, west-central tropical, northeast tropical, and east tropical.
Reference
Paniceae. FTEA.
[GB]

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

    • 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 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 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 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0