e-Key <span id="jodit_selection_marker_1709026165635_9137089284430346" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>v3 - Dichan<span id="jodit_selection_marker_1709026165635_867685995050441" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>thium
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Poaceae - Panicoideae - Andropogoneae - Sorghinae - Dichanthium Willemet

Description:

  • Perennial, rarely annual, tufted
  • Leaf blade narrow-linear, rolled or usually expanded, sometimes aromatic; ligule an unfringed to a fringed membrane
  • Inflorescence terminal, or sometimes axillary in spatheate, leafy, false panicles, or digitate or subdigitate racemes with or without 1 or more homogamous pairs of spikelets; internodes and pedicels linear, solid, truncate to oblique at tip; spikelets in pairs, secund, in long-short combinations: one sessile, the other pedicelled, free of rachis
  • Sessile spikelet dorsiventrally compressed, falling with glumes; glumes ± equal; lower glume lanceolate or elliptic-oblong, obtuse to truncate, hairy, 2-keeled, acute to broadly obtuse; upper glume somewhat thinner in texture, 1-keeled, ciliate
  • Florets 2, lower floret sterile, reduced to a lanceolate hyaline lemma, entire, awnless; upper floret bisexual; lemma less firm than glumes, reduced to a linear, entire, hyaline stipe, awned; awn geniculate, twisted, longer than body of lemma; callus very short, rounded, hairy; palea minute or suppressed
  • Lodicules 2, fleshy, minute, glabrous
  • Stamens 1-3
  • Ovary ellipsoid, glabrous; style plumose above
  • Caryopsis oblong, dorsiventrally compressed
  • Pedicelled spikelet similar to sessile spikelet, male or sterile
  • x = 10 (polyploidy)

Nomenclature:

  • Dichanthium Willemet
    • Willemet: 11 (1796)
    • Chippindall: 480 (1955)
    • Clayton & Renvoize: 722 (1982)
    • Clayton & Renvoize: 342 (1986)
    • Gibbs Russell et al.: 105 (1990)
    • Watson & Dallwitz: 320 (1994)

Distribution & Notes:

  • Global: Species ± 20, Old World tropics
  • Southern Africa: Species 2, 1 of which is naturalised, widespread except in Northern Cape and not recorded in Western 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. & 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
  • WATSON, L. & DALLWITZ, M.J. 1994. The grass genera of the world, revised edn. CAB International, Oxon
  • WILLEMET, R. 1796. Dichanthium. Neue Annalen der Botanick. (Usteri) 18