1. Family: Rubiaceae Juss.
    1. Pentas Benth.

      1. This genus is accepted, and its native range is Tropical & S. Africa, Comoros, Madagascar, Arabian Peninsula.

    [FTEA]

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

    Habit
    Mostly perennial (rarely biennial) herbs or shrubs, with erect or straggling stems from a fibrous or woody rootstock
    Leaves
    Leaves paired or in whorls of 3–5; stipules divided into 2-many filiform colleter-tipped segments
    Flowers
    Flowers small to very large, hermaphrodite, mono-, di- or tri-morphic, mostly in much-branched terminal complicated cymose inflorescences, the individual branches often becoming spicate in fruit In monomorphic flowers stamens enclosed in an abrupt apical dilation of the tube and style exserted; in dimorphic flowers the tube is gradually dilated at the apex in short-styled flowers and abruptly dilated in long-styled flowers; in rare cases, trimorphism is shown and the third form has both stamens and style included in the tube
    Calyx
    Calyx-tube ovoid or globose, sometimes with a free annular part at the top; lobes usually 5, either equal or unequal, 1–3 being larger than the others or sometimes foliaceous
    Corolla
    Corolla-tube shortly cylindrical to narrowly tubular, 2–40 times as long as wide, hairy in the throat; lobes ovate or oblong
    Ovary
    Ovary bilocular, with numerous ovules in each attached to placentas affixed to the septum
    Fruits
    Capsule obtriangular or ovoid, ribbed, beaked, opening at the apex, the beak splitting into 4 valves; capsule sometimes separating into 2 cocci
    Seeds
    Seeds minute, brownish, irregularly globose or tetrahedral, with reticulate testa
    Note
    Rhaphides are plentiful in most of the tissues.
    [FZ]

    Rubiaceae, B. Verdcourt. Flora Zambesiaca 5:1. 1989

    Habit
    Mostly perennial (rarely biennial) herbs or shrubs, with erect or straggling stems from a fibrous or woody rootstock.
    Leaves
    Leaves paired or in whorls of 3–5; stipules divided into 2-many filiform colleter-tipped segments.
    Calyx
    Calyx tube ovoid or globose, sometimes with a free annular part at the top; lobes usually 5, either equal or unequal, 1–3 being larger than the others or sometimes foliaceous.
    Corolla
    Corolla tube shortly cylindrical to narrowly tubular, 2–40 times as long as wide, hairy in the throat; lobes ovate or oblong.
    Flowers
    In monomorphic flowers stamens enclosed in an abrupt apical dilation of the tube and style exserted; in dimorphic flowers the tube is gradually dilated at the apex in short-styled flowers and abruptly dilated in long-styled flowers; in rare cases, trimorphism is shown and the third form has both stamens and style included in the tube. Flowers small to very large, hermaphrodite, mono-, di- or tri-morphic, mostly in much-branched terminal complicated cymose inflorescences, the individual branches often becoming spicate in fruit.
    Ovary
    Ovary bilocular, with numerous ovules in each attached to placentas affixed to the septum.
    Fruits
    Capsule obtriangular or ovoid, ribbed, beaked, opening at the apex, the beak splitting into 4 valves; capsule sometimes separating into 2 cocci.
    Seeds
    Seeds minute, brownish, irregularly globose or tetrahedral, with reticulate testa.
    Note
    Rhaphides are plentiful in most of the tissues.

    Images

    Distribution

    Native to:

    Angola, Burundi, Cameroon, Central African Repu, Chad, Comoros, Congo, Djibouti, Eritrea, Ethiopia, Gabon, Guinea, Kenya, KwaZulu-Natal, Madagascar, Malawi, Mozambique, Nigeria, Northern Provinces, Rwanda, Saudi Arabia, Somalia, Sudan, Tanzania, Uganda, Yemen, Zambia, Zaïre, Zimbabwe

    Introduced into:

    Colombia, Cook Is., Jawa, Norfolk Is., Society Is., Trinidad-Tobago, Windward Is.

    Pentas Benth. appears in other Kew resources:

    First published in Bot. Mag. 70: t. 4086 (1844)

    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.

    Literature

    Flora of West Tropical Africa
    • Verdcourt in Bull. Jard. Bot. Brux. 23: 237 (1953).
    • —F.T.A. 3: 45
    Flora Zambesiaca
    • Verdc. in Bull. Jard. Bot. Brux. 23: 237–371 (1953).
    • in Curtis, Bot. Mag. 70, t. 4086 (1844).
    Flora of Tropical East Africa
    • Verdc. in B.J.B.B. 23: 237–371 (1953)
    • in Bot. Mag. 70, t. 4086 (1844)

    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 2018. 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 2018. 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