e-Key v3 - Cytinus
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Rafflesiaceae - Cytinus L.

Description :

  • Holoparasitic, rootless perennials, without chlorophyll, rich in tannins, with thick, somewhat fleshy, simple stems, growing on roots; monoecious or dioecious; endophytic body in the form of strings or plates of cells inside host plant
  • Leaves reduced to alternating/spiralling coloured scales
  • Inflorescence : flowers solitary or in short, few-flowered racemes; flowering stems or branches bursting through cortex of host tissues
  • Flowers unisexual, regular, usually in axils of bracts and bracteoles; ± horseshoe-shaped nectar glands present at base of central column
  • Perianth 1-whorled; tepals 4-9, fleshy, fused at base into a very short tube
  • Male flowers : stamens 8-12; filaments fused into a stout capitate column with fused anthers at apex; anthers 2-thecous, extrorse
  • Female flowers : ovary inferior, 1-locular or by projection of parietal placentas, falsely up to 6- or more-locular; ovules very numerous, anatropous to orthotropous, uni- or bitegmic; stylar column stout; stigma globose, grooved with apex obtuse or radially lobed
  • Fruit a berry
  • Seeds many, minute, hard; embryo undifferentiated; endosperm 1 layer thick
  • x = 8 (1 report, polyploidy)

Nomenclature:

  • Cytinus L.
    • Linnaeus: 576 (1764) name conserved
    • Hooker: 106 (1873)
    • Hooker: 118 (1880)
    • Hill: 485 (1912)
    • Marloth: 174 (1913)
    • Harms: 276 (1935)
    • Adamson: 343 (1950)
    • Webb: 50 (1964)
    • Oliver: t. 1486 (1967)
    • Meijer: 562 (1993)

Distribution & Notes:

  • Global : Species ± 10, Mediterranean region, Africa, Madagascar
  • Southern Africa : Species 2, Northern, Western and Eastern Cape

References:

  • ADAMSON, R.S. 1950. Rafflesiaceae Dum. In R.S. Adamson & T.M. Salter, Flora of the Cape Peninsula . Juta, Cape Town
  • HARMS, H. 1935. Rafflesiaceae tribus Cytineae . Die natürlichen Pflanzenfamilien , edn 2, 16b
  • HILL, A.W. 1912. Cytinaceae . Flora capensis 5,1
  • HOOKER, J.D. 1873. Cytinaceae . In A. de Candolle, Prodromus 17. Masson & Sons, Paris
  • HOOKER, J.D. 1880. Cytinaceae . In G. Bentham & J.D. Hooker, Genera plantarum 3. Lovell Reeve & Co., London
  • LINNAEUS, C. 1764. Genera plantarum , edn 6. Laurentius Salvius, Stockholm
  • MARLOTH, R. 1913. Rafflesiaceae tribe Cytineae . The Flora of South Africa 1. Darter & Co., Cape Town
  • MEIJER, W. 1993. Rafflesiaceae . In K. Kubitzki, J.G. Rohwer & V. Bittrich, The families and genera of vascular plants - dicotyledons 2. Springer-Verlag, Berlin
  • OLIVER, E.G.H. 1967. Cytinus sanguineus . The Flowering Plants of Africa 38
  • WEBB, D.A. 1964. Rafflesiaceae . Flora europaea 1