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

Poaceae - Arundinoideae - Arundineae - Pentameris P.Beauv.

Description :

  • Perennial, tufted or decumbent, up to 650 mm tall, sometimes cushion-like
  • Leaf blade long-linear, hard, rigid, wiry or flat and open, often strongly curved or curled, usually tightly rolled at an early stage; ligule a fringe of hairs
  • Inflorescence a large, open or somewhat contracted panicle with 5-20 spikelets; spikelets solitary, pedicelled
  • Spikelet laterally compressed, disarticulating above glumes; glumes ± equal, much longer than spikelet, similar, membranous to chartaceous, 1-3-nerved, glabrous or hairy, awned or awnless
  • Florets 1 or 2, sometimes with rudiments of a third floret, bisexual; lemma similar in texture to firmer than glumes, membranous, oblong, 7-9(-11)-nerved, not keeled, hairy from between nerves, 2-lobed, lobes entire or shortly 2-toothed, each with a loosely twisted or straight bristle or awn from inner margin, central awn from between lobes, 4 or 5 times as long as lemma; awn flat, twisted, geniculate; callus short, blunt, hairy; palea ± as long as lemma, 2-keeled, hairy between keels, 2-toothed at apex
  • Lodicules 2, glabrous or ciliolate
  • Stamens 3
  • Ovary obovoid, with a dense tomentum of branched hairs at apex; styles distinct, short, plumose
  • Fruit an achene with free pericarp, fusiform, subglobose to globose or cuneate

Nomenclature:

  • Pentameris P.Beauv.
    • Palisot de Beauvois: 92 (1812)
    • Stapf: 512 (1899)
    • Schweickerdt: 88 (1938)
    • Chippindall: 251 (1955)
    • Clayton & Renvoize: 174 (1986)
    • Gibbs Russell et al.: 251 (1990)
    • Barker: 25 (1993)
    • Watson & Dallwitz: 705 (1994)

Distribution & Notes:

  • Southern Africa : Species 9, mainly mountainous areas of Western Cape into adjoining regions of Eastern Cape

References:

  • BARKER, N.P. 1993. A biosystematic study of Pentameris ( Arundineae , Poaceae ). Bothalia 23
  • 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. 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
  • SCHWEICKERDT, H.G. 1938. Descriptions and notes on South African grasses. Feddes Repertorium 43
  • STAPF, O. 1898-1900. Gramineae . Flora capensis 7
  • WATSON, L. & DALLWITZ, M.J. 1994. The grass genera of the world , revised edn. CAB International, Oxon