e-Key <span id="jodit_selection_marker_1706782930438_560935462145185" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>v3 - Antith<span id="jodit_selection_marker_1706782930438_5249316151635726" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>rixia
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Asteraceae - Gnaphalieae - Antithrixia DC.

Description:

  • Perennial shrublets with young branches cobwebby
  • Leaves in fascicles, alternate or decussate, linear, sessile, involute, adaxially tomentose, apically mucronate, margins entire
  • Capitula radiate, solitary, terminal, many-flowered
  • Involucral bracts imbricate, linear-oblong, scarious
  • Receptacle flat, epaleate
  • Ray florets female, fewer than disc florets, yellow with purple bands dorsally, cypsela and pappus as in disc florets
  • Disc florets bisexual, corolla tube cylindrical, 5-toothed, yellow, lobes erect
  • Anthers ecalcarate, with short tails
  • Style bifid, branches truncate with obtuse sweeping hairs apically, stigmatic surface separated
  • Cypselas rod-like, with 10 vascular bundles, glabrous or with a few scattered twin hairs
  • Pappus of rigid, subscabrid bristles in 1 row, sometimes connate at base

Nomenclature:

  • Antithrixia DC.
    • Candolle: 277 (1838)
    • Harvey: 293 (1865)
    • Bremer: 449 (1978)
    • Anderberg: 65 (1991)
    • Anderberg: 330 (1994)

Distribution & Notes:

  • Southern Africa: Monotypic: Antithrixia flavicoma DC., endemic to Namaqualand (Western Cape)

References:

  • ANDERBERG, A.A. 1991. Taxonomy and phylogeny of the tribe Gnaphalieae (Asteraceae). Opera Botanica 104
  • ANDERBERG, A.A. 1994. Tribes Inuleae, Plucheeae, Gnaphalieae. In K. Bremer, Asteraceae, cladistics and classification. Timber Press, Portland, Oregon
  • BREMER, K. 1978. Oreoleysera and Athrixia, new and old South African genera of the Compositae. Botaniska Notiser 131
  • CANDOLLE, A.P. DE. 1838. Compositae. Prodromus 6. Treuttel & Würtz, Paris
  • HARVEY, W.H. 1865. Compositae. Flora capensis 3

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