e-Key v<span id="jodit_selection_marker_1707485644718_5381326565121567" data-jodit_selection_marker="start" style="line-height: 0; display: none;"></span>3 - *Cathara<span id="jodit_selection_marker_1707485644718_7338441694422799" data-jodit_selection_marker="end" style="line-height: 0; display: none;"></span>nthus
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Apocynaceae - Plumerioideae - Plumerieae - *Catharanthus G.Don

Description:

  • Perennial, rarely annual herbs or subshrubs
  • Leaves opposite, simple, entire, shortly petioled, penninerved; axillary glands many in a fringe; stipules 0
  • Flowers axillary, solitary or paired, fairly large, white or pink
  • Calyx small to medium-sized, divided almost to base; lobes 5, subulate
  • Corolla salver-shaped; tube slender, cylindric, slightly widened near mouth; mouth constricted, velvety within, without appendages; lobes large, overlapping to the left
  • Stamens in widened part of tube; filaments very short; anthers 4-locular, free from stigma, ovate-lanceolate, acute, shortly and obtusely 2-lobed at base
  • Disc replaced by two long, linear glands; glands alternating with carpels
  • Ovary of 2 free carpels; style filiform; stigma depressed-capitate with a long, hyaline, reflexed frill at base and a minute, obtuse, 2-lobed apiculus surrounded by a very short, erect, membranous rim; ovules many, 2-seriate
  • Mericarps 2, follicular, cylindric, slightly spreading
  • Seeds small; testa rugose; hilum lateral
  • x = 8

Nomenclature:

  • *Catharanthus G.Don
    • Don: 95 (1838)
    • Codd: 267 (1963)
    • Plaizier: 453 (1985)
  • Vinca L.
    • Linnaeus: 209 (1753) in part
  • Lochnera Rchb. ex Endl.
    • Endlicher: 583 (1838)

Distribution & Notes:

  • Global: Species 8, 1 in India and Sri Lanka, the others confined to Madagascar
  • Southern Africa: A Madagascan species, *Catharanthus roseus (L.) G.Don, is a widespread, sometimes cultivated, weed of waste places in warm, dry areas, especially in eastern southern Africa

References:

  • CODD, L.E. 1963. Apocynaceae. Flora of southern Africa 26
  • DON, G. 1838. A general history of the dichlamydeous plants 4. Rivington, London. Originally issued as: A general system of gardening and botany
  • ENDLICHER, S.L. 1838. Iconographia generum plantarum. Vienna, Fr. Beck
  • LINNAEUS, C. 1753. Species plantarum. Laurentius Salvius, Stockholm
  • PLAIZIER, A.C. 1985. Apocynaceae: Adenium, Catharanthus and Diplorhynchus. Flora zambesiaca 7,2