e-Key <span id="jodit_selection_marker_1710153439025_02809582174149039" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>v3 - Gymnoste<span id="jodit_selection_marker_1710153439026_08710317067318263" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>phium
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Asteraceae - Astereae - Gymnostephium Less.

Description:

  • Subshrubs or lignescent herbs, branched, with vestiture of stout, thick-based, usually spreading hairs
  • Leaves alternate, sessile, linear, entire, usually ciliate, sometimes glandular-hairy
  • Capitula radiate, many-flowered, usually solitary, on long peduncles, rarely corymbose
  • Involucre campanulate; bracts in 3 or 4 rows, linear, oblong or elliptic, 1-nerved, with broad scarious margins, usually ciliate, glabrous or scurfy on back
  • Receptacle somewhat concave, honeycombed, epaleate
  • Ray florets female; corolla white or blue, tube cylindric, with linear or oblong-linear, 2- or 3-fid lamina
  • Style terete, with flattened, lanceolate or linear branches
  • Disc florets functionally male, sterile; corolla yellow; tube cylindric, campanulate or widening gradually above
  • Anthers linear, ecalcarate and ecaudate; with ovate, membranous, apical appendage
  • Cypselas oblong-obovate, 2-nerved, strongly compressed, surface black at maturity and minutely 'pebbled', moderately to densely invested with short, white papillae, glabrous to glabrate
  • Pappus of ray florets 0 or of 1 or 2 barbellate or plumose caducous bristles in a single row; of disc florets of 2 or 3 barbellate or plumose caducous bristles

Nomenclature:

  • Gymnostephium Less.
    • Lessing: 185 (1832)
    • Harvey: 66 (1865)
    • Bremer: 422 (1994)
    • Nesom: 85 (1994)

Distribution & Notes:

  • Southern Africa: Species 8, endemic, Western Cape

References:

  • BREMER, K. 1994. Asteraceae, cladistics & classification. Timber Press, Portland, Oregon
  • HARVEY, W.H. 1865. Compositae. Flora capensis 3
  • LESSING, C.F. 1832. Synopsis generum Compositarum. Duncker & Humblot, Berlin
  • NESOM, G.L. 1994. Repartition of Mairia (Asteraceae: Astereae). Phytologia 76,2