e-Key v3 - Anthospermum
SANBI Flora Keys Logo
Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Rubiaceae - Rubioideae - Anthospermeae - Anthospermum L.

Description :

  • Large or dwarf shrubs, short-lived subshrubs or perennial herbs, male, female, bisexual, bisexual + female, or occasionally male + bisexual + female, bisexual + male, or male + female
  • Leaves decussate or occasionally in whorls of 3(4), often seemingly in much larger numbers at nodes, blades ± broad and large to ± ericoid and small, mostly narrowed to base, acute to acuminate (seldom ± mucronate or ± obtuse) at apex, shortly petiolate to sessile; stipular sheaths ± cup-shaped, bearing 1 to many setae or fimbriae on either side
  • Inflorescence frequently leafy and inconspicuous, made up of mostly subsessile, many- to very few-flowered cymes; in dioecious taxa often sexually dimorphic (female inflorescence contracted, ± cylinder-like)
  • Flowers mostly subsessile, subtended by a pair of leafy bracts, male, bisexual or female, 4- or 5-merous
  • Calyx : lobes large, conspicuous to small, indistinct or ± lacking
  • Bisexual and male flowers: corolla with tube cylindrical, broadly funnel-shaped to subcampanulate, lobes recurved, ± lanceolate; anthers yellowish to whitish, exserted, dangling on long, slender, filiform filaments
  • Female flowers : corolla much smaller than in male flowers; tube cylindrical; lobes mostly erect, linear to ± lanceolate
  • Ovary bicarpellate, 2-locular, in 2 species 1 carpel reduced; ovule 1 per locule; style 0 or very short; stigmas usually 2, long-exserted, hairy, greyish to greenish white, seldom purplish red
  • Fruit crowned by persistent calyx lobes, supported by a ± U-shaped carpophore, dehiscing into two mericarps, each convex on dorsal side, plane to concave or sometimes hollowed out and with a prominent to inconspicuous median, longitudinal ridge on ventral side
  • x = 11 (aneuploids, polyploidy)

Nomenclature:

  • Anthospermum L.
    • Linnaeus: 1058 (1753)
    • Linnaeus: 479 (1754)
    • Sonder: 26 (1865)
    • Hooker: 140 (1873)
    • Schumann: 129 (1891)
    • Phillips: 735 (1951)
    • Verdcourt: 324 (1976)
    • Puff: 8 (1986)
    • Puff: 150 (1989)

Distribution & Notes:

  • Global : Species 40, Africa and Madagascar
  • Southern Africa : Species 21, widespread

References:

  • HOOKER, J.D. 1873. Rubiaceae . In G. Bentham & J.D. Hooker, Genera plantarum 2. L. Reeve, London
  • LINNAEUS, C. 1753. Species plantarum . Laurentius Salvius, Stockholm.
  • LINNAEUS, C. 1754. Genera plantarum , edn 5. Laurentius Salvius, Stockholm
  • PHILLIPS, E.P. 1951. The genera of South African flowering plants. Memoirs of the Botanical Survey of South Africa No. 25
  • PUFF, C. 1986. Paederieae , Anthospermeae , Rubieae . Flora of southern Africa 31, part 1, fascicle 2
  • PUFF, C. 1989. Otiophora , Paederia , Anthospermum , Rubia & Galium . Flora zambesiaca 5,1
  • SCHUMANN, K.M. 1891. Rubiaceae . Die natürlichen Pflanzenfamilien 4,4
  • SONDER, O.W. 1865. Rubiaceae . Flora capensis 3
  • VERDCOURT, B. 1976. Flora of tropical East Africa . Rubiaceae (part 1)