e-Key<span id="jodit_selection_marker_1699279423416_5886013101417527" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span> v3 - Gi<span id="jodit_selection_marker_1699279423416_03819859710367868" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>sekia
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Gisekiaceae - Gisekia L.

Description:

  • Annual or perennial herbs with annual shoots, prostrate or ascending to erect, with several semisucculent stems often tinged with red, with numerous prominent, linear, whitish raphides especially on leaves, minutely asperous on nodes and inflorescence; containing betalains
  • Leaves opposite, linear to oblanceolate or elliptic, base sometimes attenuate into ill-defined petiole, margin entire; stipules 0
  • Inflorescence axillary or terminal, laxly dichasial-cymose to densely umbellate; peduncle present or absent; bracts minute or obsolete
  • Flowers bisexual or rarely unisexual, regular
  • Sepals 5, free
  • Petals (staminodes) 0
  • Stamens 5-15(-20), arising just below gynoecium; filaments free, widening below; anthers 2-thecous, opening by longitudinal slits
  • Gynoecium superior, apocarpous, of (3-)5(6) or 10-15 free carpels, each with solitary ovule and style on inner margin
  • Fruit a cluster of 3-15 ± heterocarpic mericarps: either muricate or almost smooth with thin, ventral sutures
  • Seeds thickly lens-shaped, black, microscopically pitted; embryo ± annular, peripheral; cotyledons oblong, fleshy; endosperm starchy
  • x = 8 or 9 (1 report, high polyploidy)

Nomenclature:

  • Gisekia L.
    • Linnaeus: 554 (1771)
    • Harvey: 155 (1860)
    • Pax & Hoffman: 192 (1934)
    • Phillips: 285 (1951)
    • Adamson: 131 (1961)
    • Friedrich: P26:4-4 (1966)
    • Bogle: 435 (1970)
    • Gonçalves: 304 (1970)
    • Gonçalves: 522 (1978)
    • Gilbert: 345 (1993a)
    • Gilbert: 118 (1993b)
    • Rohwer: 514 (1993)

Distribution & Notes:

  • Global: Species 7, tropical and subtropical Africa and Asia
  • Southern Africa: Species 2, widespread in Namibia, Botswana, Northern Province, North-West, Gauteng, Mpumalanga, Swaziland, Free State, KwaZulu-Natal and Northern Cape

References:

  • ADAMSON, R.S. 1961. The South African species of Aizoaceae X. Gisekia. Journal of South African Botany 27
  • BOGLE, A.L. 1970. The genera of Molluginaceae and Aizoaceae in the southeastern United States. Journal of the Arnold Arboretum 51
  • FRIEDRICH, H.C. 1966. Aizoaceae. Prodromus einer Flora von Südwestafrika 26
  • GILBERT, M.G. 1993a. A review of Gisekia (Gisekiaceae). Kew Bulletin 48
  • GILBERT, M.G. 1993b. Gisekiaceae. Flora of Somalia 1
  • GONÇALVES, M.L. 1970. Aizoaceae. Conspectus florae Angolensis 4
  • GONÇALVES, M.L. 1978. Molluginaceae. Flora zambesiaca 4
  • HARVEY, W.H. 1860. Phytolaccaceae. Flora capensis 1
  • LINNAEUS, C. 1771. Mantissa plantarum. Laurentius Salvius, Stockholm
  • PAX, F. & HOFFMANN, K. 1934. Aizoaceae. Tribe Gisekieae. Die natürlichen Pflanzenfamilien, edn 2, 16c
  • PHILLIPS, E.P. 1951. The genera of South African flowering plants, edn 2. Memoirs of the Botanical Survey of South Africa No. 25
  • ROHWER, J.G. 1993. Phytolaccaceae. Genus of uncertain affinity. In K. Kubitzki, J.G. Rohwer & V. Bittrich, The families and genera of vascular plants - dicotyledons 2. Springer-Verlag, Berlin