e-Key v<span id="jodit_selection_marker_1706793527810_46479988359844104" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>3 - *Axo<span id="jodit_selection_marker_1706793527810_3492698006603465" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>nopus
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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 - *Axonopus P.Beauv.

Description:

  • Perennial, tufted, stoloniferous
  • Leaf blade somewhat linear, expanded or folded, apex abruptly rounded; ligule a narrow, fringed membrane
  • Inflorescence of 2-many slender racemes, digitate or subdigitate; spikelets solitary, subsessile, alternating on one side of 3-angled rachis, back of upper lemma turned away from rachis
  • Spikelet lanceolate to oblong, dorsiventrally compressed, falling with glumes; glumes unequal, awnless; lower glume absent; upper glume membranous, as long as spikelet, 4- or 5-nerved
  • Florets 2; lower floret sterile, with lemma similar to upper glume; palea 0; upper floret bisexual, lemma firmer than glumes, chartaceous to crustaceous, as long as spikelet, obtuse, 4-nerved, glabrous, entire, with back turned away from rachis, margins narrow, inrolled and covering only edges of palea, awnless; palea equal or subequal to lemma, indurated
  • Lodicules 2, minute, broadly cuneate
  • Stamens 3
  • Ovary glabrous; styles distinct, plumose
  • Caryopsis ellipsoid, dorsiventrally compressed
  • x = 10 (high polyploidy)

Nomenclature:

  • *Axonopus P.Beauv.
    • Palisot de Beauvois: 12 (1812)
    • Stapf: 417 (1899)
    • Stapf: 566 (1919)
    • Clayton & Renvoize: 613 (1982)
    • Clayton & Renvoize: 289 (1986)
    • Clayton: 91 (1989)
    • Gibbs Russell et al.: 59 (1990)
    • Watson & Dallwitz: 160 (1994)

Distribution & Notes:

  • Global: Species 110, tropical and subtropical America
  • Southern Africa: Species 1: *Axonopus affinis Chase, naturalised in Africa, Mpumalanga, Swaziland, KwaZulu-Natal and Eastern Cape

References:

  • 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
  • PALISOT DE BEAUVOIS, A.M.F.J. 1812. Essai d'une nouvelle agrostographie. Fain, Paris
  • STAPF, O. 1898-1900. Gramineae. Flora capensis 7
  • 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