December 14
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Plant Species of the genus Alstonia

Information about this genus
Name: Alstonia
Cultivation: CULTIVATION: All species are frost tender and some will only thrive in the tropics and nearby subtropics. In fertile soil and a sheltered position the trees make fast growth, preferring full sun. Propagation is normally from seed, although cuttings can be struck.
Description: There are about 40 species in this genus of evergreen trees and shrubs, related to frangipani (Plumeria) and the humble periwinkles (Vinca). Most are native to tropical Asia and Australasia, but smaller numbers occur in tropical America and Africa. Some are tall rainforest trees, others range into much drier monsoonal scrubs. All their parts bleed a milky, caustic sap when cut, and the bark and roots are intensely bitter and probably poisonous?a variety of local medicinal and pesticidal uses have been recorded. The simple, smooth-edged leaves are in whorls of up to 7 and the branches of saplings are likewise whorled, in a manner reminiscent of pines (Pinus); but later upward growth is by one or more lateral branches from the previous growth flush, curving at the base to become erect, and this pattern is repeated. Flowers are in clusters terminating branchlets, mostly fairly small with 5 white petals arranged in the same propellor-like manner as periwinkle flowers. Fruit are slender and bean-like, splitting when ripe to release silky-plumed seeds into the wind.

Specie Vernacular Zone
Alstonia angustiloba 11?12
Alstonia constricta 9-11
Alstonia pneumatophora 11?12
Alstonia scholaris 11-12
Alstonia venenata 10-12

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