1. Family: Rubiaceae Juss.
    1. Calycosiphonia Pierre ex Robbr.

      1. This genus is accepted, and its native range is Tropical Africa.

    [FTEA]

    Rubiaceae, B. Verdcourt. Flora of Tropical East Africa. 1976

    Habit
    Shrubs or small trees
    Leaves
    Leaves opposite, petiolate, papery to subcoriaceous, glabrous; domatia absent or present in axils of lateral nerves but rather inconspicuous and sparsely ciliate; stipules shortly sheathing, with triangular limbs bearing a subulate to linear caducous lobe, pubescent and beset with colleters inside
    Flowers
    Flowers hermaphrodite, 7–8-merous, axillary with 1–4 flowers borne in each axil, stalked; bracts 2–3, cupular or saucer-shaped (referred to as calyculi), usually totally obscuring the pedicel, pubescent and beset with numerous colleters inside, often with linear or subfoliaceous lobes
    Calyx
    Calyx-tube campanulate, obscured by the calyculi; limb truncate or with rudimentary teeth
    Corolla
    Corolla white or ? yellow, glabrous outside; tube cylindrical below but widening above, slightly shorter than or slightly longer than the lobes; lobes contorted in bud, 7–8, spreading
    Stamens
    Stamens 7–8, attached at the mouth of corolla-tube, exserted, erect; filaments, about 1/3 the length of the anther; anthers narrowly linear-lanceolate, with thecae transversely divided into cells, apiculate at apex, scarcely hastate at base, attached about 1/3 of their length from the base
    Disc
    Disc annular
    Pistil
    Ovary 2-locular; placentas small, fleshy, attached near the middle of the septum; ovules 1–2, deeply immersed in the placenta; style cylindrical, slender, glabrous, exceeding the corolla-tube; stigma exserted, 2-lobed
    Fruits
    Fruit rather fleshy, 1–2-seeded; calyx-limb persistent
    Seeds
    Seeds dark in colour, ± hemispherical; small depression present on apex or on curved face near apex; testa apparently absent, surface smooth to somewhat rugulose at low power magnifications; endosperm dark purplish in colour (preserved material), entire; embryo straight, with radicle inferior.
    [FZ]

    Rubiaceae, D.M.Bridson & B.Verdcourt. Flora Zambesiaca 5:3. 2003

    Leaves
    Leaves opposite, petiolate, membranous to subcoriaceous, glabrous; domatia absent or present in axils of lateral nerves but rather inconspicuous, sparsely ciliate; stipules shortly sheathing with triangular limbs bearing a subulate to linear caducous lobe, pubescent and with colleters inside.
    Inflorescences
    Inflorescences axillary with 1–4 flowers borne in each axil, stalked; bract and bracteoles 2–3, cupular or saucer-shaped, usually totally obscuring the pedicel, pubescent and with numerous colleters inside, each cupule with 2 stipule-derived and 2 leaf- derived lobes, the latter often linear or subfoliate.
    Flowers
    Flowers hermaphrodite, 7–8-merous.
    Calyx
    Calyx tube campanulate, obscured by the upper bracteolar cupule; limb truncate or with rudimentary teeth.
    Corolla
    Corolla white or ?yellow, glabrous outside; tube cylindrical below but widening above, slightly shorter or slightly longer than the lobes; lobes contorted to the left in bud, 7–8 spreading.
    Stamens
    Stamens 7–8, attached at the mouth of corolla tube, exserted, erect; filament about one third the length of the anther; anther narrowly linear-lanceolate with theca transversely divided into cells, apiculate at apex, scarcely hastate at base, attached about one third of their length from the base.
    Disc
    Disk annular.
    Pistil
    Ovary 2-locular; placentas small, fleshy, attached near the middle of the septum; ovules 1–2, deeply immersed in the placenta; style cylindrical, slender, glabrous, exceeding the corolla tube; pollen presenter exserted, 2-lobed.
    Fruits
    Fruit rather fleshy, 1–2-seeded; calyx limb persistent.
    Seeds
    Seeds dark in colour, ± hemispherical, with a small depression at the apex or on the curved face near the apex; testa absent, surface smooth to somewhat rugulose at low power magnifications; endosperm dark purplish in colour (in preserved material), entire; embryo straight with inferior radicle.
    Habit
    Shrubs or small trees.

    Images

    Distribution

    Native to:

    Angola, Cameroon, Central African Repu, Congo, Equatorial Guinea, Gabon, Ghana, Gulf of Guinea Is., Ivory Coast, Kenya, Malawi, Mozambique, Nigeria, Sudan, Tanzania, Uganda, Zaïre

    Calycosiphonia Pierre ex Robbr. appears in other Kew resources:

    First published in Bull. Jard. Bot. Natl. Belg. 51: 370 (1981)

    Accepted by

    • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.

    Literature

    Flora Zambesiaca
    • in Bull. Jard. Bot. Belg. 51: 370 (1981).
    Flora of Tropical East Africa
    • in B.J.B.B. 51: 370 (1981)

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Flora of Tropical East Africa
    Flora of Tropical East Africa
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0