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''Carissa'' is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia. Until recently about 100 species were listed, but most of them have been relegated to the status of synonyms or assigned to other genera, such as ''Acokanthera''.Kew World Checklist of Selected Plant Families
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Floridata page for ''Carissa macrocarpa''
/ref> ''Carissa'' species are grown from seed or cuttings and tolerate slight frost.
''Carissa'' is a genus of shrubs or small trees native to tropical and subtropical regions of Africa, Australia and Asia. Until recently about 100 species were listed, but most of them have been relegated to the status of synonyms or assigned to other genera, such as ''Acokanthera''.Kew World Checklist of Selected Plant Families/ref>
Description
Different species of ''Carissa'' grow as shrubs or trees, attaining respective heights of 2 to 10 m tall. They bear smooth, sharp Thorns, spines, and prickles, thorns that often are formidable; they are true botanical thorns, being modified branches, Morphology (biology), morphologically speaking. The thorns may be simple, as in ''Carissa spinarum'', dichotomously forked as in ''Carissa bispinosa'', or dichotomously branched as in ''Carissa macrocarpa''. The leaf, leaves are a rich, glossy, waxy green, smooth, simple, entire and Leaf shape, elliptic to Leaf shape, ovate or nearly Leaf shape, lanceolate. They are 2–8 cm long, partly depending on the species, and generally are thick and leathery. In suitable climates some species flower through most of the year. The flowers are nearly sessile, 1–5 cm diameter, with a five-lobed white or pink-tinged corolla. They may be solitary or borne in clusters in an umbel or corymb.Dyer, R. Allen, The Genera of Southern African Flowering Plants”. , 1975 The flowers of some species some have a fragrance reminiscent of ''Gardenia'', which adds to their popularity as garden plants. The fruit is a plum-like Berry (botany), berry in the shape of a prolate spheroid, like that of a rugby ball. In colour they vary according to species. In some species they are red when ripe, whereas others turn a glossy purple-black. Typically they are 1.5–6 cm in length, and usually contain 1-4 flat brown seeds, but up to 16 in some species.Fruit
The fruit of the carissa is an oblong berry which contains numerous small seeds. The green fruit is poisonous, sometimes dangerously so, as is the entire plant; however, the ripe fruits are edible (though possibly tart), with some species having fruity flavors and overtones of strawberry or apple. One single fruit contains around 52 mg of potassium, 7 mg vitamin C, 2.2 mg calcium, 3.2 mg magnesium and 1.4 mg phosphorus. In its native range, the ripened fruits of ''C. macrocarpa'' are especially relished by local peoples, eaten raw or used to make jelly, sweets or candies. Numerous species of birds and mammals, and some herbivorous reptiles, are drawn to the vivid red ''Carissa'' fruits, consuming them and distributing the seed. ''Carissa carandas'' is cultivated in several Asiatic countries for its fruit, which is variously used in cooking, confectionaries and in folk medicine (see article).Horticulture
''Carissa'' species generally respond well to gardening and are valued in topiary and in forming strong, dense, decorative, thorny, flowering hedge (barrier), hedges. Some sprawling varieties are useful as ground covers./ref> ''Carissa'' species are grown from seed or cuttings and tolerate slight frost.
Species
The following species are recognised. # ''Carissa bispinosa'' (L.) Desf. ex Brenan - widespread in E + S Africa from Kenya to Cape Province # ''Carissa boiviniana'' (Baill.) Leeuwenb. - Madagascar # ''Carissa carandas'' L. - India, Bangladesh; naturalized in S China, Mauritius, Nepal, Pakistan, Indochina, Java, Philippines, West Indies # ''Carissa haematocarpa'' (Eckl.) A.DC. - Namibia, Cape Province of South Africa # ''Carissa macrocarpa'' (Eckl.) A.DC. - Kenya + Zaire south to Cape Province; naturalized in S China, Ascension Island, Hawaii, Florida, Texas, Mexico, Central America, West Indies # ''Carissa pichoniana'' Leeuwenb. - Madagascar # ''Carissa spinarum'' L. - Africa, Arabian Peninsula, Indian Subcontinent, Indochina, New Guinea, New Caledonia, Australia # ''Carissa tetramera'' (Sacleux) Stapf - E + S Africa from Kenya to KwaZulu-Natal # ;Formerly included * ''Acokanthera oblongifolia'' (Hochst.) Codd (as ''C. oblongifolia'' Hochst.) * ''Acokanthera schimperi'' (A.DC.) Benth. & Hook.f. ex Schweinf. (as ''C. schimperi'' A.DC.)References
{{Taxonbar, from=Q1470978 Carissa, Apocynaceae genera Fruits originating in Africa Plants used in bonsai