e-Key v3 - Oncinema
SANBI Flora Keys Logo
Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Apocynaceae - Asclepiadoideae - Asclepiadeae - Oncinema Arn.

Description :

  • Perennial, twining herb
  • Leaves shortly petiolate, slender
  • Flowers in lax cymes or racemes, lateral at nodes
  • Corolla with shallowly campanulate tube and 5 suberect, linear lobes
  • Corona of 5 lobes ± as long as staminal column; lobes free, erect, laterally compressed, linear, grooved down the back
  • Anthers 2-locular, with ovate, membranous appendages; pollinia minute; caudicles shorter than pollinia
  • Style produced into tapering, bifid column as long as corolla
  • Follicles solitary by abortion, narrowly fusiform
  • Seeds brown, linear-lanceolate, convex on back, concave on face, narrowly winged, smooth or with irregular ridges

Nomenclature:

  • Oncinema Arn.
    • Arnott: 261 (1834)
    • Bullock: 184 (1963)
  • Glossostephanus E.Mey.
    • Meyer: 217 (1838)
    • Brown: 740 (1908)
    • Phillips: 604 (1951)

Distribution & Notes:

  • Southern Africa : Species 1: Oncinema lineare (L.f.) Bullock; S Western Cape to Uitenhage District (Eastern Cape)

References:

  • ARNOTT, G.A.W. 1834. Oncinema . Edinburgh New Philosophical Journal 17
  • BROWN, N.E. 1908. Asclepiadeae . Flora capensis 4,1
  • BULLOCK, A.A. 1963. Notes on African Asclepiadaceae : X. Kew Bulletin 17
  • MEYER, E.H.F. 1838. Commentariorum de plantis Africae australioris . Voss, Leipzig
  • PHILLIPS, E.P. 1951. The genera of South African flowering plants, edn 2. Memoirs of the Botanical Survey of South Africa No. 25