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

Poaceae - Panicoideae - Paniceae - Setariinae - Stenotaphrum Trin.

Description :

  • Annual or perennial, tufted, stoloniferous, usually creeping, rooting at nodes; culms and overlapping leaf sheaths usually compressed, abruptly contracted at base, often grouped in a fan-shaped arrangement; ligule a narrow, fringed membrane
  • Inflorescence mostly terminal, spike-like, secund, of several to many short racemes embedded in cavities in a thickened central axis, each raceme bearing up to 8 spikelets on a rachis that is usually produced beyond upper spikelet to a subulate tip; spikelets sessile to shortly pedicelled, falling entire at maturity or together with adjacent internode of central axis; lower glume abaxial
  • Spikelet dorsiventrally compressed, lanceolate or ovate, plump, awnless; glumes very unequal, dissimilar, membranous, awnless; lower glume generally shorter than spikelet, nerveless; upper glume similar to lower or ± as long as spikelet, 5-9-nerved
  • Florets 2; lower floret male or sterile; lemma chartaceous to coriaceous, acute or acuminate, 3-9-nerved; palea well developed; upper floret bisexual; lemma firmer than glumes, not becoming indurated, similar to lower but smaller, faintly 3-5-nerved, glabrous, entire, margins inrolled and covering palea but leaving tip free, awnless; palea usually indurated, 2-nerved
  • Lodicules 2
  • Stamens 3
  • Ovary glabrous; styles free, plumose above
  • Caryopsis lanceolate to oblong, plano-convex
  • x = 9 (polyploidy)

Nomenclature:

  • Stenotaphrum Trin.
    • Trinius: 175 (1820)
    • Stapf: 438 (1899)
    • Chippindall: 367 (1955)
    • Sauer: 202 (1972)
    • Clayton & Renvoize: 547 (1982)
    • Clayton & Renvoize: 293 (1986)
    • Clayton: 111 (1989)
    • Gibbs Russell et al.: 314 (1990)
    • Watson & Dallwitz: 901 (1994)

Distribution & Notes:

  • Global : Species 7, tropics and subtropics
  • Southern Africa : Species 2: Stenotaphrum secundatum (Walt.) Kuntze mainly along coast from KwaZulu-Natal, Eastern Cape to Western Cape with records in eastern Caprivi (Namibia) and S Mpumalanga; S. dimidiatum (L.) Brongn. sporadic in N KwaZulu-Natal and Eastern Cape

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. 1989. Gramineae . Flora zambesiaca 10, 3
  • 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
  • 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
  • SAUER, J.D. 1972. Revision of Stenotaphrum ( Gramineae : Paniceae ) with attention to its historical geography. Brittonia 24
  • STAPF, O. 1898-1900. Gramineae . Flora capensis 7
  • TRINIUS, C.B. 1820. Fundamenta agrostographiae . Heuber, Vienna
  • WATSON, L. & DALLWITZ, M.J. 1994. The grass genera of the world , revised edn. CAB International, Oxon