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

Mesembryanthemaceae - Ruschioideae - Delosperma Group - Oscularia Schwantes

Description :

  • Densely branched shrublets, with erect or spreading reddish stems
  • Leaves opposite, subequal, somewhat united at base, triquetrous to trigonous, short, up to ± 20 mm long and 13 mm broad, mostly with prominently dentate keel and margins (red-toothed in one species), greyish green to pale blue waxy leaves
  • Flowers solitary or in rich cymes, mostly on bibracteate peduncles, rarely sessile, up to ± 15 mm in diameter; remaining open; almond-scented
  • Sepals 5
  • Petals not much more than 1-seriate, white to pink
  • Stamens and short staminodes collected into a cone, both papillate near base
  • Nectary of 5 ± separate, dark green, crenulate glands
  • Ovary convex to conical on top; placentas parietal; stigmas 5, concealed by stamens
  • Fruit a 5-locular capsule, of Lampranthus type; grey to brown; expanding keels diverging from base, more than half as long as valves; valve wings very broad and rectangular; covering membranes with inconspicuous closing ledges at distal ends; closing devices 0, but placenta ending in a tiny to small knob
  • Seeds ovoid, verrucose, brown
  • x = 9
  • Flowering mid-winter to mid-summer
  • Distinguishing characters :
    • Small shrubs with greyish green, waxy, sometimes dentate leaves
    • Flowers scented
    • Stamens and staminodes collected into a cone

Nomenclature:

  • Oscularia Schwantes
    • Schwantes: 187 (1927)
    • Herre: 244 (1971)
    • Glen: 693 (1980)
    • Smith et al.: 336 (1998)
    • Hartmann: 44 (1998)

Distribution & Notes:

  • Southern Africa : Species 23, typically in the fynbos vegetation of the Western Cape, extending slightly into the Northern Cape, a single species: Oscularia deltoides (L.) Schwantes, has been collected just east of Albertinia in the Western Cape

References:

  • GLEN, H.F. 1980. Proposal (537) to conserve the generic name 2405 Lampranthus N.E.Br. (1930) against Oscularia Schwantes (1927) ( Mesembryanthemaceae ). Taxon 29
  • 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
  • SCHWANTES, G. 1927. Einige neue Mesembrianthemaceen. Möllers Deutsche Gärtner-Zeitung 42
  • 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