e-Key v<span id="jodit_selection_marker_1708072562490_6360515441129226" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>3 - *Chromo<span id="jodit_selection_marker_1708072562490_8628603402121053" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>laena
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Asteraceae - Eupatorieae - *Chromolaena DC.

Description:

  • Sparingly to densely branched herbs or semiscandent shrubs
  • Leaves opposite, triangular to elliptic, margins subentire to lobed
  • Capitula discoid; 10-40-flowered, in lax to dense corymbs
  • Involucral bracts imbricate, ovate to lanceolate, apex often herbaceous or coloured
  • Receptacle flat or convex, sometimes paleate
  • Corolla white; cylindrical, glandular, often hairy
  • Anther: appendage sometimes with crenulate margins
  • Style: branch appendage linear, sometimes papillose
  • Cypselas prismatic, with 5, rarely 3 ribs, setose, sometimes glandular
  • Pappus of many capillary, scabrid bristles
  • x = 10 (aneuploids)

Nomenclature:

  • *Chromolaena DC.
    • Candolle: 133 (1836)
    • King & Robinson: 197 (1970)
    • Henderson et al.: 34 (1987)
    • King & Robinson: 383 (1987)
    • Bremer et al.: 655 (1994)
  • Heterolaena Sch.Bip. ex Benth.
    • Bentham: 245 (1873).
  • Osmia Sch.Bip.
    • Schultz 'Bipontinus': 251 (1866).
  • Eupatorium section Cylindrocephala DC.: 141 (1836)

Distribution & Notes:

  • Global: Species ± 165, all natives of North and South America, the West Indies
  • Southern Africa: 1 weedy species: *Chromolaena odorata (L.) R.M.King & H.Robinson from South America, naturalised in Mpumalanga and KwaZulu-Natal

References:

  • BENTHAM, G. 1873. Compositae. In G. Bentham & J.D. Hooker, Genera Plantarum 2. Lovell Reeve & Co., London
  • BREMER, K., ANDERBERG, A.A., KARIS, P.O. & LUNDBERG, J. 1994. Tribe Eupatorieae. In K. Bremer, Asteraceae, cladistics & classification. Timber Press, Portland, Oregon
  • CANDOLLE, A.P. DE. 1836. Compositae. Prodromus 5: 133, 141. Treuttel & Würtz, Paris
  • HENDERSON, M., FOURIE, D.M.C., WELLS, M.J. & HENDERSON, L. 1987. Declared weeds and alien invader plants in South Africa. Department of Agriculture and Water Supply, Pretoria
  • KING, R.M. & ROBINSON, H. 1987. The genera of the Eupatorieae (Asteraceae). Monographs in systematic botany from the Missouri Botanical Garden 22
  • KING, R.M. & ROBINSON, H. 1970. The genus Chromolaena. Phytologia 20
  • SCHULTZ, C.H. BIPONTINUS. 1866. Pollichia 22-24

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