Beentje, H. (2021) Apocynaceae, sous-familes I. Apocynoideae et II. Rauvolfioideae Flore d' Afrique Centrale Jardin botanique de Meise
Fayaz, F. (2011) Encyclopedia of Tropical Plants Firefly Books, New Zealand
Gledhill, D. (2002) The Names of Plants (3rd edn) Cambridge University Press, Cambridge
Trees or shrubs; branches whorled, mostly 4 or 5 together; latex. Leaves whorled, rarely opposite; at end of branchlets; lamina glossy; numerous lateral veins. Inflorescence terminal; cymes usually 1-5 in thyrses, or compound umbels. Flowers white, yellow or pink; lobes basally connate, corolla salver-form, tube cylindric. Fruit paired follicles, free or connate. Seeds oblong or linear; apices long-bearded. Derivation of name: Named for Professor Charles Alston (1716 - 1760) of Edinburgh Worldwide: c. 60 species in Africa, Central America, China, Indomalesia and the western Pacific DRC: 2 taxa. |
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| Species | Botanical divisions | Content |
| boonei De Wild. | II,III,IV,V,VI,VII,IX | Description |
| congensis Engl. | II,III,IV,V,VI,VII,IX | Description |