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

DICOTYLEDON - ASTERIDAE - SOLANALES - Convolvulaceae

Compiled by W.G. Welman

Description :

  • Herbs or shrubs, frequently twining, rarely leafless parasites ( Cuscuta )
  • Leaves alternate, simple, sometimes palmately or pinnately lobed (scale-like in Cuscuta ); stipules usually 0
  • Flowers regular, bisexual, often showy, in pedunculate, bracteate, axillary cymes or sometimes solitary
  • Calyx (4)5(6)-partite, persistent, imbricate
  • Corolla united, usually only slightly 5-lobed, campanulate or funnel-shaped, rarely cylindric
  • Disc (nectary) often present and surrounding base of ovary
  • Stamens 5, alternating with corolla lobes, arising from base of corolla tube; filaments with anthers 2-thecous and dehiscing longitudinally
  • Ovary superior, 1-4-locular, entire or sometimes deeply lobed, with 1-4 basal ovules in each locule; styles 1 or 2, terminal on ovary or gynobasic, sometimes with the 2 styles connate at base; stigmas terete, capitate, dilated, or linear
  • Fruit capsular or indehiscent
  • Seeds as many as ovules or fewer, glabrous, villous, woolly, or verrucose; embryo straight; cotyledons foliaceous, sometimes small or 0 ( Cuscuta ); endosperm scanty to fairly copious

Nomenclature:

  • Convolvulaceae
    • Meeuse: 641 (1957)
    • Verdcourt: 1 (1963)
    • Gonçalves: 1 (1987)
    • Meeuse & Welman: 1 (2000)

Distribution & Notes:

  • Global : Genera ± 55, species ± 1700, cosmopolitan, especially warm regions, mostly natives of tropical Asia and America, extending to Australia, Africa and Madagascar
  • Southern Africa : Genera 16, species 115

References:

  • GONÇALVES, M.L. 1987. 117-118. Convolvulaceae - Cuscutaceae . Flora zambesiaca 8,1
  • MEEUSE, A.D.J. 1957. The South African Convolvulaceae . Bothalia 6
  • MEEUSE, A.D.J. & WELMAN, W.G. 2000. Convolvulaceae . Flora of southern Africa 28,1
  • VERDCOURT, B. 1963. Flora of tropical East Africa . Convolvulaceae