| Home | > | List of families | > | Poaceae | > | Eragrostis | > | rogersii |
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| Description: |
Caespitose annual; culms up to 70 cm tall, erect or ascending, branched or unbranched, glabrous at the nodes, the internodes with scattered crateriform glands especially below the nodes; leaf sheaths with scattered crateriform glands mostly on the midnerve; ligule a line of hairs; leaf laminas 3–10 cm × 2.5–5 mm, broadly linear, flat or involute, loosely pilose above or glabrous, with scattered crateriform glands on the midnerve beneath and a few along the margins, green or glaucous, stiff and somewhat pungent.Panicle 8–16 cm long, elliptic-ovate to narrowly oblong-ovate, the spikelets evenly distributed on stiff pedicels 1.5–6 mm long, the primary branches stiffly ascending or spreading, loosely racemose (rarely themselves branched), not in whorls, terminating in a fertile spikelet, shortly pilose in the axils, with crateriform glands along the main axis, branches and pedicels, these sometimes numerous, rarely absent.Spikelets 5.5–17 × 3–4 mm, ovate-elliptic to oblong, strongly laterally compressed, 7–36-flowered, the florets disarticulating from the apex downwards, the rhachilla fragile; glumes subequal, 2.5–4 mm long, reaching to c. 3/4 the way along the adjacent lemmas, keeled, lanceolate in profile, scabrid on the keel, glabrous or ciliolate on the margins, acute at the apex; lemmas 3.2–3.5 mm long, keeled, ovate-oblong in profile, firmly membranous with distinct lateral nerves, slightly diverging from the rhachilla but those in opposite rows overlapping and concealing the rhachilla, green or pallid variegated with purple, scaberulous on the keel, faintly asperulous on the flanks, acute to subacute and often mucronate at the apex; palea glabrous on the flanks, the keels slender, wingless, scabrid above, stiffly ciliolate below; anthers 3, 1–1.5 mm long.Caryopsis 0.5–0.6 mm long, broadly elliptic to subrotund. |
| Notes: | |
| Derivation of specific name: | |
| Habitat: | Mopane and miombo wooded grasslands on well-drained sandy soils, rocky hillsides and Kalahari Sands; also in disturbed ground |
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| Worldwide distribution: | Known only from the Flora Zambesiaca area |
| Botswana distribution: | N |
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| Insects associated with this species: | |
| Spot characters: | Display spot characters for this species |
| Literature: |
Cope, T.A. (1999). Poaceae Flora Zambesiaca 10(2) Page 97. (Includes a picture). Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 104. Poilecot, P. (2007). Eragrostis species of Zimbabwe Éditions Quae,Versailles, France Pages 110 - 111. (Includes a picture). Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 137. |
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