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

Mesembryanthemaceae - Ruschioideae - Mitrophyllum Group - Oophytum N.E.Br.

Description :

  • Dwarf, compact, heterophyllous perennials less than 25 mm high
  • Leaves opposite, largely connate and united into small ovoid bodies with a somewhat gaping fissure, with visible bladder cell idioblasts on surfaces, bright brownish red towards end of growing season, otherwise dark green to brownish green or yellowish green; gradually absorbed by following leaf pair and leaving whitish sheath; two leaf pairs develop per season on each of up to 20 branches per individual
  • Flowers solitary, with bracts exserted from orifice, ± 25 mm in diameter; opening midday, closing in evening
  • Sepals 6(7), shortly tubular
  • Petals 2- or 3-seriate, white, pink or pale violet
  • Stamens with filaments papillate at base, white, pink or pale violet; staminodes present, coloured as petals
  • Nectary a crenulate ring
  • Ovary somewhat convex with (5)6 ridges on top; placentas basal/parietal; stigmas (5)6, filiform
  • Fruit a (5)6-locular capsule, of Delosperma type; developing directly on top of drying plant body; valve wings broad; covering membranes rarely present as narrow rims over locules; closing bodies 0
  • Seeds many in each locule, small, compressed
  • x = 9
  • Flowering in winter
  • Distinguishing characters :
    • Stemless perennials, with clusters of ovoid, papillate leaves
    • Old leaves forming papery sheaths enclosing the emerging young leaf pair

Nomenclature:

  • Oophytum N.E.Br.
    • Brown: 413 (1925)
    • Herre: 236 (1971)
    • Ihlenfeldt: 303 (1978)
    • Smith et al.: 122 (1998)

Distribution & Notes:

  • Southern Africa : Species 3, restricted to the quartz fields of the Knersvlakte north of Vanrhynsdorp in the Western Cape

References:

  • BROWN, N.E. 1925. Mesembryanthemum and some new genera separated from it. Gardeners' Chronicle 78
  • HERRE, H. 1971. The genera of the Mesembryanthemaceae . Tafelberg, Cape Town
  • IHLENFELDT, H.-D. 1978. Morphologie und Taxonomie der Gattung Oophytum N.E.Br. ( Mesembryanthemaceae ). Monographie der Mitrophyllinae Schwantes III. Botanische Jahrbücher 99
  • 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