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

Rubiaceae - Antirheoideae - Vanguerieae - Rytigynia Blume

Description :

  • Shrubs or small trees, occasionally somewhat scrambling
  • Leaves opposite or occasionally in whorls of 3, petiolate; often with domatia in axils of nerves beneath; stipules connate at base, oblong or triangular, villous within, often ± persistent, ending in a linear or subulate, ± deciduous appendage
  • Flowers axillary, solitary or in 2-10(-15)-flowered, sometimes umbel-like cymes; peduncles and pedicels mostly well developed; bracts and sometimes bracteoles present, small
  • Calyx with tube ± subglobose; limb short, truncate or shortly toothed
  • Corolla 5-lobed, white, cream, yellowish or greenish; lobes shorter than to longer than tube, acute to very distinctly long-apiculate or with a filiform appendage; tube cylindric, glabrous or hairy with a ring of deflexed hairs in middle
  • Stamens 5, slightly to distinctly exserted; anthers often mucronate or slightly appendaged, often papillate; filaments very short
  • Disc depressed, glabrous
  • Ovary 2-5(6)-locular; ovules 1 per locule, pendulous, attached to upper part of septum; style usually exserted, slightly swollen at base; stigmatic knob coroniform, 2-5-lobed at apex
  • Fruit a subglobose drupe, with (2-)4 or 5 pyrenes; pyrenes narrowly ± reniform or boat-shaped, often pitted
  • x = 11 (1 report, polyploidy)

Nomenclature:

  • Rytigynia Blume
    • Blume: 178 (1850)
    • Robyns: 132 (1928)
    • Phillips: 731 (1951)
    • Verdcourt: 145 (1987)
    • Verdcourt & Bridson: 802 (1991)
    • Bridson: 284 (1998)

Distribution & Notes:

  • Global : Species 70, tropical Africa
  • Southern Africa : Species 2, Botswana and N KwaZulu-Natal

References:

  • BLUME, C.L. 1850. Museum botanicum . E.J. Bril, Leiden
  • BRIDSON, D.M. 1998. Rubiaceae . Flora zambesiaca 5,2
  • PHILLIPS, E.P. 1951. The genera of South African flowering plants. Memoirs of the Botanical Survey of South Africa No. 25
  • ROBYNS,W. 1928. Monographieae Vangueriae . Bulletin du Jardin Botanique de l'Etat, à Bruxelles 11
  • VERDCOURT, B. 1987. Notes on African Rubiaceae - Vanguerieae . Kew Bulletin 42
  • VERDCOURT, B. & BRIDSON, D.M. 1991. Flora of tropical East Africa . Rubiaceae (part 3)