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

Mesembryanthemaceae - Ruschioideae - Titanopsis Group - Schwantesia Dinter

Description :

  • Compact, dwarf perennials forming tufts with many branches bearing a cluster of long-lived leaf pairs
  • Leaves opposite, those of a pair dissimilar, ± boat-shaped, keeled, flat or slightly convex on upper surface, often widened towards apex and lobed or toothed on margins, light grey to bluish green; epidermis papillate; outer epidermal wall with a thick crystal layer
  • Flowers solitary, terminal, ± 60 mm in diameter, with ebracteate pedicel up to 50 mm long; opening around mid-afternoon and staying open until nightfall
  • Sepals 5, unequal
  • Petals 1-seriate, light- to golden-yellow, rarely white
  • Stamens 4-seriate, epapillate
  • Nectary a crenulate, yellowish green ring
  • Ovary convex on top; placentas parietal; stigmas 5, greenish, reflexed towards tips
  • Fruit a 5-locular capsule of Delosperma type; covering membranes vestigial, as narrow ledges spreading from septa, with weak, central column; expanding keels parallel but not touching, yellowish, broadening towards tips; valve wings broad; closing bodies 0
  • Seeds glittering, minutely textured
  • x = 9
  • Flowering in autumn
  • Distinguishing characters :
    • Compact perennials with internodes enclosed by leaves which are asymmetric, toothed, erect, sometimes whitish

Nomenclature:

  • Schwantesia Dinter
    • Dinter: 234 (1927)
    • Friedrich: 122 (1970)
    • Herre: 280 (1971)
    • Zimmermann: 81 (1996a)
    • Zimmermann: 257 (1996b)
    • Smith et al.: 152 (1998)

Distribution & Notes:

  • Southern Africa : Species 8, occurs in the Northern Cape, from Bushmanland in the east, through the Richtersveld, to the southern parts of Namibia

References:

  • DINTER, K. 1927. Schwantesia rüdebuschii Dtr. gen. novum. Möllers Deutsche Gärtner-Zeitung 42
  • FRIEDRICH, H.C. 1970. Aizoaceae . Prodromus einer Flora von Südwestafrika 27
  • 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
  • ZIMMERMANN, N.F.A. 1996a. Schwantesia constanceae N.Zimm., spec. nov.-eine neue Art aus dem südlichen Namibia. Kakteen und andere Sukkulenten 47
  • ZIMMERMANN, N.F.A. 1996b. The genus Schwantesia Dinter. Cactus and Succulent Journal (U.S.) 68