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Pakistan | Family List | Apocynaceae

3. Alstonia R. Br. in Mem. Wern. Soc. 1:75. 1809. (conserved name); DC., Prodr. 8.1844; Benth. & Hook. f., Gen. Pl. 2:705. 1876; Hook. f., Fl. Brit. Ind. 3.641. 1882; Talbot, For. Fl. 2 215. 1911; Bailey, St. Cyclop. Hort. 1:266 1947; Cook. Fl. Pres. Bomb. 2:194. 1904; De Jong in Meded Landbouwhogeschool Wageningen 79 (13) 1979.


Trees or shrubs with usually whorled branches. Leaves generally whorled. Inflorescence paniculate or corymbose terminal cymes. Flower salverform. Calyx short, 5 lobed; glands lacking inside. Corolla 5-lobed with cylindric tube, hairy only at the mouth. Stamens 5, included, inserted in the corolla tube, with lanceolate anthers. Disc of various shapes, annular, truncate or lobed. rarely absent. Ovules many in each carpel, multiseriate; style filiform; stigma short or 2 toothed. Follicles 2, cylindrical; seeds many, oblong or linear, usually hairy.

A genus with about 30 species, distributed in tropical Africa, Asia, Australia and Polynesia, represented in Pakistan by two cultivated species.

1 Leaves with 15-20 pairs of lateral nerves. Corolla lobes glabrous out side, overlapping to the right in bud   1 Alstonia macrophylla
+ Leaves with 30-60 pairs of lateral nerves. Corolla lobes pubescent out side, overlapping to the left in bud   2 Alstonia scholaris

Lower Taxa

Related Synonym(s):


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