e-Key <span id="jodit_selection_marker_1706792294198_004226242170279226" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>v3 - Ast<span id="jodit_selection_marker_1706792294199_0643252121419764" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>ridia
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Mesembryanthemaceae - Ruschioideae - Ruschia Group - Astridia Dinter

Description:

  • Robust, erect shrublets; internodes shorter than leaves; young parts variably minutely pubescent, or glabrous
  • Leaves ascending or spreading, usually decurrent, bluntly triquetrous, often subfalcate to falcate, usually 30-60 mm long, 10-30 mm in diameter, with sheath 2-6 mm long, greyish green, persistent; epidermis with convex cells or ± distinctly papillate
  • Flowers solitary or 3 together, lateral ones developing after marked interval, large, shortly pedunculate, opening in daytime; bracts embracing receptacle
  • Sepals 6, unequal, inner ones subulate, with membranous margins
  • Petals with outer ones longer, 1- or 2-seriate, inner ones narrower, 2- or 3-seriate, white, lemon, orange, pink or various shades of purple and red, centre often differently coloured
  • Stamens and staminodes in 6-8 series, conically collected, coloured, outer ciliately papillate in lower part, inner ones more densely papillate near middle
  • Nectary a crenulate ring
  • Ovary: apical lobes distant, acutely or obtusely compressed, rarely reaching nectary; placentas parietal; stigmas 6, subulate-caudate, rarely exceeding height of stamens
  • Fruit a 6-locular capsule of Ruschia type, obconic below; sutures strongly compressed; expanded valves widely spreading, wingless; expanding keels parallel below, diverging upwards, aristate; closing bodies and covering membranes well developed, with 2 processes or additional closing devices on underside near exit, obconical
  • Seeds covered with long, brown, papillate hairs, shortly echinate, tuberculate or muricate
  • x = 9
  • Flowering mainly in late summer
  • Distinguishing characters:
    • Robust perennials, erect, woody with large grey-green, smooth or textured leaves
    • Stems sheathing at their partially fused bases
    • Flowers large, solitary with bracts just below them
    • Seeds echinate, tuberculate or hairy

Nomenclature:

  • Astridia Dinter
    • Dinter: 430, 447 (1926)
    • Friedrich: 17 (1970)
    • Herre: 88 (1971)
    • Glen: 203 (1986)
    • Smith et al.: 348 (1998)

Distribution & Notes:

  • Southern Africa: Species 7, across the border between South Africa and Namibia, along the lower reaches of the Orange River. This is an extremely arid area of the Northern Cape

References:

  • DINTER, K. 1926. Twenty days in a botanist's paradise. Gardeners' Chronicle 8
  • FRIEDRICH, H.C. 1970. Aizoaceae. Prodromus einer Flora von Südwestafrika 27
  • GLEN, H.F. 1986. Numerical taxonomic studies in the subtribe Ruschiinae (Mesembryanthemaceae) - Astridia, Acrodon and Ebracteola. Bothalia 16
  • HERRE, H. 1971. The genera of the Mesembryanthemaceae. Tafelberg, Cape Town
  • SMITH, G.F., CHESSELET, P., VAN JAARSVELD, E.J., HARTMANN, H., HAMMER, S., VAN WYK, B-.E., BURGOYNE, P., KLAK, C. & KURZWEIL, H. 1998. Mesembs of the world. Briza, Pretoria