e-Key v3 - Sehima
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Poaceae - Panicoideae - Andropogoneae - Ischaeminae - Sehima Forssk.

Description :

  • Annual or perennial, tufted
  • Leaf blade linear, expanded, glabrous; ligule a fringed membrane to a fringe of long hairs
  • Inflorescence a single, spike-like, terminal, cylindrical raceme, exserted from sheath; internodes stoutly linear to subclavate; rachis and pedicels hairy on either side with conspicuous woolly hairs; spikelets paired, secund, in long-short combinations: one sessile, the other pedicelled, pedicels free from rachis
  • Sessile spikelet 9-15 mm long, usually ± laterally compressed, disarticulating with glumes; glumes ± equal, dissimilar; lower glume coriaceous, deeply grooved or flat on back, 2-lobed or not lobed, 2-keeled, narrowly winged towards apex, mucronate; upper glume boat-shaped, keeled upwards, produced into a long, fine bristle-like awn
  • Florets 2; lower floret male; lemma hyaline, entire; palea well developed; upper floret bisexual; lemma less firm than glumes, hyaline, hairy or glabrous, 2-lobed, awned from sinus; awn geniculate, much longer than body of lemma, glabrous or hairy; callus obtuse, inserted in concave top of internode; palea well developed, lanceolate, hyaline
  • Lodicules 2, fleshy, glabrous
  • Stamens 3
  • Ovary glabrous
  • Caryopsis lanceolate-oblong, dorsiventrally compressed
  • Pedicelled spikelet strongly dorsiventrally compressed, flat; lower glume usually distinctly nerved, male or sterile; lemma awnless
  • x = 10 (17, 20)

Nomenclature:

  • Sehima Forssk.
    • Forsskål: 178 (1775)
    • Stapf: 35 (1917)
    • Chippindall: 489 (1955)
    • Clayton & Renvoize: 749 (1982)
    • Clayton & Renvoize: 348 (1986)
    • Gibbs Russell et al.: 292 (1990)
    • Watson & Dallwitz: 862 (1994)

Distribution & Notes:

  • Global : Species 7, Africa, India and Australia
  • Southern Africa : Species 2: Sehima galpinii Stent from northern provinces of South Africa to N KwaZulu-Natal, and S. ischaemoides Forssk. in Grootfontein area of Namibia and in N Botswana

References:

  • CHIPPINDALL, L.K.A. 1955. A guide to the identification of grasses in South Africa. In D. Meredith, The grasses and pastures of South Africa . Central News Agency, Cape Town
  • CLAYTON, W.D. & RENVOIZE, S.A. 1982. Flora of tropical East Africa . Gramineae (Part 3)
  • CLAYTON, W.D. & RENVOIZE S.A. 1986. Genera graminum. Grasses of the world. Kew Bulletin . Additional series 13
  • FORSSKÅL, P. 1775. Flora aegyptico-arabica . Möller, Copenhagen
  • GIBBS RUSSELL, G.E., WATSON, L., KOEKEMOER, M., SMOOK, L., BARKER, N.P., ANDERSON, H.M. & DALLWITZ. M.J. 1990. Grasses of southern Africa. Memoirs of the Botanical Survey of South Africa No. 58
  • STAPF, O. 1917-1920. Gramineae . Flora of tropical Africa 9
  • WATSON, L. & DALLWITZ, M.J. 1994. The grass genera of the world , revised edn. CAB International, Oxon