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This genus is accepted, and its native range is NE. Tropical Africa.
Ricinus communis (Euphorbiaceae)

[FZ]

Euphorbiaceae, A. Radcliffe-Smith. Flora Zambesiaca 9:4. 1996

Morphology General Habit
Monoecious, glabrous annual or perennial herb or shrub, often tree-like.
Morphology Leaves
Leaves alternate, petiolate, stipulate, peltate, palmately-lobed, the lobes glandular-serrate, penninerved.
Morphology Leaves Petiole
Petioles glanduliferous at apex and base.
Morphology Leaves Stipules
Stipules united to form a caducous sheath.
Morphology Reproductive morphology Inflorescences
Inflorescences paniculate, leaf-opposed or subterminal, male in the lower half, female in the upper or rarely all female; bracts soon caducous.
Morphology Reproductive morphology Flowers
Male flowers: pedicels jointed, bibracteolate; buds globose; calyx membranous, closed at first, later splitting into 3–5 valvate lobes; petals absent; disk absent; stamens up to c. 1000, the filaments variously united, anthers basifixed, the cells subglobose, longitudinally dehiscent; pistillode absent. Female flowers: pedicels considerably elongating in fruit; buds conical; sepals 5, valvate, soon caducous; petals absent; disk absent; ovary 3-celled, with 1 ovule per cell, echinate or smooth; styles 3, ± free or slightly connate at the base, bipartite, papillose-plumose, usually dark red.
Morphology Reproductive morphology Fruits
Fruit 3-lobed, echinate or smooth, the spines accrescent, dehiscing into 3 bivalved cocci, leaving a prominent persistent columella.
Morphology Reproductive morphology Seeds
Seeds dorsiventrally compressed-ovoid, smooth, usually marmorate, carunculate; testa crustaceous; albumen fleshy; cotyledons broad, flat.

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Herb to soft-wooded tree; glabrous throughout
Morphology Leaves
Leaves alternate; petiole glandular at base; leaf-blade peltate, palmately lobed, with 2 glands at petiole insertion; stipules united to form a sheath which falls off quickly
Morphology Reproductive morphology Inflorescences
Monoecious; flowers in leaf-opposed or subterminal racemes with clusters of male flowers below and laxer clusters of female flowers towards tip; flowers with 2 basal bracteoles, pedicels articulated
Morphology Reproductive morphology Flowers
Female: buds conical; sepals 5, valvate, soon falling; petals and disc absent; ovary 3-celled, ovules solitary; styles free, 2-fid, papillose-plumose Male: calyx valvately 3–5-lobed; petals and disc absent; stamens up to 1000, filaments irregularly joined into bundles; pistillode absent
Morphology Reproductive morphology Fruits
Fruit a 3-lobed capsule, oblong, usually spiny
Morphology Reproductive morphology Seeds
Seeds ± compressed-ovoid, smooth; caruncle present.
Distribution
A single species which fossil evidence has shown to be native in NE Africa but now cultivated and/or escaped throughout the tropics and warm temperate regions.

[FTEA]

Euphorbiaceae, A. R.-Smith. Flora of Tropical East Africa. 1987

Morphology General Habit
A large monoecious glabrous annual or perennial herb, often attaining tree-like proportions
Morphology Leaves
Leaves alternate, petiolate, stipulate, peltate, palmately lobed, the lobes glandular-serrate, penninerved; petioles adaxially glanduliferous at and near the base, and with a pair of glands at the apex beneath the lamina
Morphology Leaves Stipules
Stipules united to form a sheath, soon caducous
Morphology Reproductive morphology Inflorescences
Inflorescences leaf-opposed or subterminal, paniculate, sessile, fairly lax, with the ♂ flowers in tight clusters in the lower half, and the ♀ flowers in more open clusters in the upper half, or rarely the inflorescence ± all ♀; bracts membranous, soon caducous
Morphology Reproductive morphology Flowers
Male flowers pedicellate, the pedicels articulate halfway up, basally bibracteolate; buds globose; calyx membranous, closed in bud, later splitting into 3–5 valvate lobes; petals 0; disc 0; stamens up to 1000, the filaments variously and haphazardly united to form a series of much-branched structures, each branch terminating in an anther, anthers basifixed, 2-thecous, the thecae distinct, subglobose, longitudinally dehiscent; pistillode 0 Female flowers pedicellate, the pedicels articulate near the apex, basally bibracteolate, considerably extending in fruit; buds narrowly conical; sepals 5, valvate, soon caducous; petals 0; disc 0; ovary 3-locular, with 1 ovule per locule, echinate or rarely smooth; styles 3, ± free or very slightly connate at the base, bipartite, papillose-plumose, commonly dark red
sex Male
Male flowers pedicellate, the pedicels articulate halfway up, basally bibracteolate; buds globose; calyx membranous, closed in bud, later splitting into 3–5 valvate lobes; petals 0; disc 0; stamens up to 1000, the filaments variously and haphazardly united to form a series of much-branched structures, each branch terminating in an anther, anthers basifixed, 2-thecous, the thecae distinct, subglobose, longitudinally dehiscent; pistillode 0
sex Female
Female flowers pedicellate, the pedicels articulate near the apex, basally bibracteolate, considerably extending in fruit; buds narrowly conical; sepals 5, valvate, soon caducous; petals 0; disc 0; ovary 3-locular, with 1 ovule per locule, echinate or rarely smooth; styles 3, ± free or very slightly connate at the base, bipartite, papillose-plumose, commonly dark red
Morphology Reproductive morphology Fruits
Fruit 3-lobed, echinate or rarely smooth, dehiscing into 3 bivalved cocci; spines (when present) accrescent; endocarp crustaceous to thinly woody; columella persistent, 3-winged
Morphology Reproductive morphology Seeds
Seeds somewhat dorsiventrally compressed-ovoid, smooth, carunculate, usually marmorate; testa crustaceous; albumen fleshy; cotyledons broad, flat.

Doubtfully present in:

Kenya

Native to:

Eritrea, Ethiopia, Somalia

Introduced into:

Alabama, Albania, Algeria, Andaman Is., Angola, Argentina Northeast, Argentina Northwest, Arizona, Arkansas, Aruba, Ascension, Assam, Bahamas, Bangladesh, Belize, Benin, Bermuda, Bismarck Archipelago, Botswana, Brazil West-Central, Bulgaria, Burkina, Burundi, California, Cambodia, Canary Is., Caprivi Strip, Caroline Is., Cayman Is., Central African Repu, Central American Pac, Central European Rus, Chad, Chagos Archipelago, Chile Central, Chile North, China North-Central, China South-Central, China Southeast, Christmas I., Cocos (Keeling) Is., Colombia, Comoros, Cook Is., Costa Rica, Cuba, Djibouti, Dominican Republic, East Aegean Is., East Himalaya, Easter Is., Egypt, El Salvador, Fiji, Florida, Gabon, Galápagos, Gambia, Georgia, Gilbert Is., Greece, Guinea, Guinea-Bissau, Gulf of Guinea Is., Gulf States, Hainan, Haiti, Hawaii, Honduras, Illinois, India, Italy, Jamaica, Juan Fernández Is., Kazan-retto, Kentucky, Kermadec Is., Korea, Leeward Is., Libya, Louisiana, Madagascar, Madeira, Maldives, Mali, Marianas, Marquesas, Marshall Is., Mauritania, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Mississippi, Missouri, Morocco, Mozambique Channel I, Namibia, Nauru, Netherlands Antilles, New Caledonia, New South Wales, New York, New Zealand North, Nicaragua, Nicobar Is., Niue, Norfolk Is., Ogasawara-shoto, Oman, Pakistan, Palestine, Paraguay, Pitcairn Is., Portugal, Puerto Rico, Queensland, Romania, Rwanda, Selvagens, Senegal, Sicilia, Society Is., Socotra, South China Sea, Southwest Caribbean, Spain, Sri Lanka, St.Helena, Sudan, Sulawesi, Tennessee, Texas, Thailand, Tibet, Togo, Tonga, Trinidad-Tobago, Tuamotu, Tubuai Is., Tunisia, Uruguay, Venezuela, Venezuelan Antilles, Wake I., Wallis-Futuna Is., West Himalaya, Western Sahara, Windward Is., Zaïre

Ricinus L. appears in other Kew resources:

First published in Sp. Pl.: 1007 (1753)

Accepted by

  • Govaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1-4: 1-1622. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Thaman, R.R., Fosberg, F.R., Manner, H.I. & Hassall, D.C. (1994). The Flora of Nauru Atoll Research Bulletin 392: 1-223.

Literature

Flora of West Tropical Africa

  • Pax & K. Hoffm. in Engl. Pflanzenr. Euph. 11: 119 (1919).
  • —F.T.A. 6, 1: 945

Flora Zambesiaca

  • Gen. Pl. ed. 5: 437 (1754).
  • Sp. Pl.: 1007 (1753)

Flora of Somalia

  • Flora Somalia, Vol 1, (1993) Author: by M. G. Gilbert [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • G.P. 3(1): 321 (1880)
  • L., Gen. Pl., ed. 5: 435 (1754)
  • Muell. Arg. in DC., Prodr. 15(2): 1016 (1866)
  • Pax in E.P. IV. 147(11): 119 (1919)
  • Prain in F.T.A. 6(1): 945 (1912)
  • Sp. Pl.: 1007 (1753)

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

Flora of Somalia
Flora of Somalia
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

Interactive Key to Seed Plants of Malesia and Indo-China
The Malesian Key Group (2010) Interactive Key to Seed Plants of Malesia and Indo-China (Version 2.0, 28 Jul 2010) The Nationaal Herbarium Nederland Leiden and The Royal Botanic Gardens Kew

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. 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 2021. 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