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{{SPlantbox
|genus=Alstonia
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Alstonia (Dr. Alston, once professor of botany at Edinburgh). Apocynaceae. Two trees of this genus are introduced in southern Florida and southern California for outdoor planting.
Corolla-tube cylindrical, usually swollen at the base, the parts spreading, usually twisted in the bud; anthers inclosed in the tube. — Between 30 and 40 species of trees or shrubs of E. India and Austral., with small white fls. in terminal cymes, and simple entire Lvs. in whorls or opposite. A. scholaris, R. Br., is the devil- tree or pali-mara of India, the bark of which is medicinal. Trees yield caoutchouc.
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