e-Key <span id="jodit_selection_marker_1710239127906_47826433721883177" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>v3 - Heterorh<span id="jodit_selection_marker_1710239127906_17458061819646642" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>achis
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Asteraceae - Arctoteae - Heterorhachis Sch.Bip. ex Walp.

Description:

  • Shrubs or shrublets, rigid, coarse, woolly or flocculent
  • Leaves alternate, dense, pinnatifid, cobwebby beneath, becoming glabrous and glossy above, lobes pungent, with revolute margins
  • Capitula radiate, in terminal racemose clusters
  • Involucre with bracts basally somewhat connate, in 3 rows, with basal ones spine-toothed, middle ones longest, entire, lanceolate-acuminate
  • Receptacle conspicuously honeycombed; outer cavities thick-walled, inner walls membranous
  • Ray florets sterile, usually with rudimentary stamens; corolla yellow, lamina 3- or 4-dentate, minutely glandular-pubescent
  • Disc florets bisexual, fertile; corolla yellow, minutely glandular-pubescent
  • Cypselas obconical, thinly and very shortly pubescent or nearly glabrous
  • Pappus of scales ± in 2 rows, lanceolate, plumose-fimbriate, outer ones the shorter

Nomenclature:

  • Heterorhachis Sch.Bip. ex Walp.
    • Walpers: 278 (1846-1847)
    • Harvey: 505 (1865) as Berkheya palmata (Thunb.) Willd.
    • Roessler: 312 (1959)
    • Bremer: 262 (1994)

Distribution & Notes:

  • Southern Africa: Monotypic: Heterorhachis aculeata (Burm.f.) Roessler, endemic to the Northern and Western Cape

References:

  • BREMER, K. 1994. Asteraceae, cladistics & classification. Timber Press, Portland, Oregon
  • HARVEY, W.H. 1865. Compositae. Flora capensis 3
  • ROESSLER, H. 1959. Revision der Arctotideae - Gorteriinae (Compositae). Mitteilungen der Botanischen Staatssamlung München 3
  • WALPERS, W.G. 1846-1847. Repertorium botanices systematicae. Vol. 6. Hofmeister, Leipzig

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