e-Key <span id="jodit_selection_marker_1707300809012_2638128200991676" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>v3 - Aren<span id="jodit_selection_marker_1707300809013_9470144524006785" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>ifera
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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 - Arenifera A.G.J.Herre

Description:

  • Shrublets, ± 150 mm high, densely branched
  • Leaves slightly connate at base, members of a leaf pair somewhat unequal in size and shape; younger ones green and viscid, increasingly covered by adhering dust and sand with age, surface glaucous and rough, with warty elevations above the subhypodermal tannin idioblasts, obtuse, somewhat convex; up to 25 mm long and 5 mm broad and thick, somewhat curved and blunt above and along sides; shorter leaves 6-15 mm long, ± 7 mm diameter
  • Flowers in ternate inflorescence, with lateral ones sometimes developing rather slowly; peduncle terete, central pedicel without bracts; flowers open at midday
  • Petals 2-seriate, recurved, linear, obtuse or subacute, ± 22 mm in diameter, pale rose to light violet, with an inconspicuous, central band
  • Sepals 4, almost equal, interior ones with a broad, membranous margin
  • Stamens with surrounding staminodes; filaments sparingly bearded at base; anthers and pollen whitish
  • Nectary a dark green crenulate ring
  • Ovary slightly convex above; placentas parietal; stigmas 8, long, subulate, conspicuously fringed at base
  • Fruit a 8-locular capsule, of Ruschia type but with valve wings, turbinate, ± 8 mm in diameter, woody, cupular, margins of valves prominent, forming a small column in centre; valves transversely ribbed, with 2 conspicuous, recurved teeth at tip; valve wings large; expanding keels parallel, diverging widely at tips; covering membranes half covering locules, additional closing devices (projections) at opening; closing bodies conspicuous
  • Seeds long, quadrangular, somewhat convex, finely ribbed longitudinally, light yellowish brown
  • Flowering autumn and winter
  • Distinguishing characters:
    • Many-branched perennials with reddish brown stems
    • Leaves often with adhering sand
    • Fruit 6-8-locular

Nomenclature:

  • Arenifera A.G.J.Herre
    • Herre: 35 (1948)
    • Hartmann: 29 (1996)
    • Smith et al.: 346 (1998)

Distribution & Notes:

  • Southern Africa: Species 4, Northern and Western Cape, from the Richtersveld to Calvinia in the Northern Cape, and the Knersvlakte to Matjiesfontein in the Western Cape

References:

  • HARTMANN, H.E.K. 1996. Miscellaneous taxonomic notes on Aizoaceae. Bradleya 14
  • HERRE, H. 1948. Arenifera Herre gen. nov. Sukkulentenkunde 2
  • 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