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

Asteraceae - Senecioneae - Steirodiscus Less.

Description :

  • Annual herbs, small, glabrous
  • Leaves alternate, linear, entire or pinnatisect, with linear lobes
  • Capitula radiate, pedunculate, many- or few-flowered, in lax corymbs or solitary
  • Involucre ecalyculate, campanulate, ovoid or subglobose; bracts ± connate
  • Receptacle convex to conical, epaleate
  • Ray florets female; corolla yellow; tube with ± oblong, obtuse or 3-toothed lamina 2-4 times as long as tube
  • Disc florets bisexual, fertile or functionally male; corolla yellow; tube becoming campanulate above, with 5 ovate or lanceolate lobes
  • Anthers ecalcarate and ecaudate; with linear or lanceolate, apical appendage; endothecial tissue radial
  • Style terete, with linear, truncate, penicillate branches
  • Cypselas obovoid or oblong, glabrous or sparsely pubescent
  • Pappus 0

Nomenclature:

  • Steirodiscus Less.
    • Lessing: 251 (1832)
    • Bremer: 509 (1994)
  • Gamolepis Less.
    • Lessing: 251 (1832)
    • Phillips: 836 (1951)
  • Psilothonna E.Mey. ex DC.
    • Candolle: 40 (1838)
    • Phillips: 16 (1950)

Distribution & Notes:

  • Southern Africa : Species 6, endemic, Northern and Western Cape

References:

  • BREMER, K. 1994. Asteraceae , cladistics & classification . Timber Press, Portland, Oregon
  • CANDOLLE, A.P. DE. 1838. Compositae . Prodromus 6. Treuttel & Würtz, Paris
  • LESSING, C.F. 1832. Synopsis generum Compositarum . Duncker & Humblot, Berlin
  • PHILLIPS, E.P. 1950. Descriptions and changes of name. Journal of South African Botany 16
  • PHILLIPS, E.P. 1951. The genera of South African flowering plants, edn 2. Memoirs of the Botanical Survey of South Africa No. 25