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 |