e-Key v3 - Pseudechinolaena
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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 - Pseudechinolaena Stapf

Description :

  • Annual, decumbent; culms trailing
  • Leaf blade lanceolate, soft and thin, acute, pseudopetiolate, sometimes cross-veined; ligule a thin, unfringed or fringed membrane
  • Inflorescence of 2-6 racemes, scattered on slender central axis, rachis narrow; spikelets paired or appearing solitary because one of the pair often very reduced, pedicelled
  • Spikelet laterally compressed, often gaping, ovoid, falling with glumes; glumes ± equal, dissimilar, herbaceous; lower glume three-quarters as long as spikelet, 3-nerved, glabrous, awnless; upper glume gibbous, as long as spikelet, 7-nerved, convex on keel, with longitudinal, translucent spots between nerves, few to many rigid hooks develop from spots (after fertilisation)
  • Florets 2; lower floret male or sterile, lemma oblong-lanceolate, chartaceous, with membranous margins, glabrous, awnless; palea convolute, chartaceous; upper floret bisexual, lemma laterally compressed, similar to, to firmer in texture than glumes, chartaceous, ovate-lanceolate to oblong, entire, subacute, faintly 3-5-nerved, awnless; palea similar to lemma in texture, faintly 2-nerved, acute
  • Lodicules 2, cuneate, fleshy
  • Stamens 3
  • Ovary glabrous; styles free, plumose
  • Caryopsis obliquely ellipsoid, flattened on ventral side
  • x = 9 (polyploidy)

Nomenclature:

  • Pseudechinolaena Stapf
    • Stapf: 494 (1919)
    • Chippindall: 364 (1955)
    • Clayton & Renvoize: 545 (1982)
    • Clayton & Renvoize: 270 (1986)
    • Clayton: 3 (1989)~(Page number suspect - No access to the publication)
    • Gibbs Russell et al.: 277 (1990)
    • Watson & Dallwitz: 781 (1994)

Distribution & Notes:

  • Global : Species 6, 5 in Madagascar, 1 pantropical
  • Southern Africa : Species 1: Pseudechinolaena polystachya (Kunth) Stapf, Northern Province and KwaZulu-Natal to 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
  • 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