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

Rubiaceae - Antirheoideae - Vanguerieae - Pachystigma Hochst.

Description :

  • Shrublets, sometimes rhizomatous with a strong rootstock
  • Leaves opposite, rarely in whorls of 3, shortly petiolate; stipules connate at base, villous within, often at length deciduous
  • Flowers in simple, axillary cymes, rarely fasicled; bracts and bracteoles present
  • Calyx 5-partite; segments triangular or linear, obtuse, often foliaceous, sometimes exceeding corolla tube
  • Corolla 5-lobed, green or greenish yellow to greenish white, glabrous or hairy; lobes variable, reflexed, often apiculate; tube shortly and broadly cylindric, with ring of deflexed hairs inside, throat usually slightly hairy
  • Stamens 5, arising in corolla mouth, exserted; filaments usually shorter than anthers; anthers lanceolate, sometimes apiculate
  • Disc annular, tumid
  • Ovary (4)5-locular with a single pendulous ovule in each locule; style slender, terete, exserted; stigmatic knob shortly and broadly cylindric, often sulcate, obscurely (4)5-lobed
  • Fruit a globose or obovoid drupe, with 2-5 pyrenes, crowned by persistent calyx limb
  • x ±11 (aneuploids)

Nomenclature:

  • Pachystigma Hochst.
    • Hochstetter: 234 (1842)
    • Sonder: 13 (1865) under Vangueria
    • Robyns: 117 (1928)
    • Verdcourt & Bridson: 764 (1991)
    • Bridson: 241 (1998)

Distribution & Notes:

  • Global : Species 10, warm parts of Africa
  • Southern Africa : Species 10, Northern Province, Mpumalanga, Swaziland, Free State, KwaZulu-Natal and Eastern Cape

References:

  • BRIDSON, D.M. 1998. Rubiaceae . Flora zambesiaca 5,2
  • HOCHSTETTER, C.F.F. 1842. Nova genera plantarum Africae tum australis tum tropica borealis proponit et describit. Flora 25
  • ROBYNS,W. 1928. Monographieae Vangueriae . Bulletin du Jardin Botanique de l'Etat, à Bruxelles 11
  • SONDER, O.W. 1865. Rubiaceae . Flora capensis 3
  • VERDCOURT, B. & BRIDSON, D.M. 1991. Flora of tropical East Africa . Rubiaceae (part 3)