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

Mesembryanthemaceae - Ruschioideae - Leipoldtia Group - Octopoma N.E.Br.

Description :

  • Dwarf shrubs becoming woody with age, up to 250 mm high, to 250 mm in diameter; branches erect to spreading; internodes ochre to darker
  • Leaves opposite, united at base, decurrent on stem, short, thick, ± triquetrous, often inflated, margins and keel ± serrate or with small teeth, surfaces rough to smooth; dark green
  • Flowers 1(-3), terminal, shortly pedicellate or subsessile, often embraced by bracts
  • Sepals 4(5), unequal
  • Petals 2- or 3-seriate, white to purple
  • Stamens arranged in a cone, filaments sometimes bearded; staminodes present
  • Nectary a crenulate, dark green ring
  • Ovary convex above; placentas parietal; stigmas 6-8, subulate
  • Fruit a 6-8-locular capsule, close to Leipoldtia type, brown, markedly convex on top in most cases; expanding keels diverging, lacerate towards tips; valve wings absent or narrow, broadest in middle; closing bodies large, white, flat; covering membranes rising towards centre; distal closing devices 0
  • Seeds rough-textured
  • Flowering mainly in winter
  • Distinguishing characters :
    • Fuit firm, brown, 8-locular

Nomenclature:

  • Octopoma N.E.Br.
    • Brown: 72, 126 (1930)
    • Herre: 232 (1971)
    • Smith et al.: 374 (1998)
    • Hartmann: 44 (1998)

Distribution & Notes:

  • Southern Africa : Species 8, in two separate areas in South Africa, one in northern Namaqualand, Northern Cape; the other in the Little Karoo, Western Cape
    • The species in this genus do not form a natural group since they have been included merely on the number of locules in the fruit (mostly 8)

References:

  • BROWN, N.E. 1930. Mesembryanthemum and some new genera separated from it. Gardeners' Chronicle 87: 72, 126
  • HARTMANN, H.E.K. 1998. New combinations in Ruschioideae , based on studies in Ruschia ( Aizoaceae ). Bradleya 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