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

Asteraceae - Senecioneae - Oligothrix DC.

Description :

  • Annual herbs, small and delicate
  • Leaves alternate, sessile, linear to linear-spathulate, shortly amplexicaul, sometimes toothed
  • Capitula radiate, few-flowered, small, laxly corymbose
  • Involucre ecalyculate, campanulate; bracts in 1 row, lanceolate, connate below, glabrous
  • Receptacle flat, epaleate
  • Ray florets female; corolla white or yellow; tube with elliptic, 3-toothed lamina ± twice its length
  • Disc florets bisexual, fertile; corolla yellow; tube campanulate above, with 5 ovate, cucullate lobes
  • Anthers ecalcarate and ecaudate; with oblong, apical appendages; endothecial tissue radial
  • Style terete, somewhat swollen at base, with linear, truncate, penicillate branches
  • Cypselas ellipsoid, ribbed, sparsely pubescent
  • Pappus of few delicate, barbellate, caducous bristles

Nomenclature:

  • Oligothrix DC.
    • Candolle: 304 (1838)
    • Harvey: 306 (1865)
    • Bremer: 506 (1994)

Distribution & Notes:

  • Southern Africa : Monotypic: Oligothrix gracilis DC., endemic, Western Cape, very rare

References:

  • BREMER, K. 1994. Asteraceae , cladistics & classification . Timber Press, Portland, Oregon
  • CANDOLLE, A.P. DE. 1838. Compositae . Prodromus 6. Treuttel & Würtz, Paris
  • HARVEY, W.H. 1865. Compositae . Flora capensis 3