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FOC | Family List | FOC Vol. 16 | Apocynaceae

23. Aganosma (Blume) G. Don, Gen. Hist. 4: 77. 1837.

香花藤属 xiang hua teng shu

Echites sect. Aganosma Blume, Bijdr. 1040. 1826; Amphineurion (A. de Candolle) Pichon.

Lianas woody, with white latex. Leaves opposite, interpetiolar line evident. Cymes terminal or axillary, corymblike; bracts and bracteoles sepal-like. Flowers large. Calyx divided halfway or deeper, with 5 or more basal glands inside, sepals usually longer than corolla tube. Corolla white, salverform; tube long cylindric, widened at base; lobes overlapping to right. Stamens inserted at lower third of tube; anthers included, sagittate, adherent to pistil head, cells with a rigid, empty basal tail; disc ringlike or tubular, lobed or dentate, surrounding ovary. Ovaries 2, distinct; ovules numerous. Style short; pistil head conical, apex 2cleft. Follicles linear, terete. Seeds flat, not beaked, coma early deciduous.

About 12 species: tropical and subtropical Asia, five species in China.

1 Corolla tube longer than sepals; calyx with a continuous row of basal glands inside; leaves with a strong intramarginal vein   1 Aganosma marginata
+ Corolla tube shorter than sepals; calyx with basal glands only inside sepal edges; leaves without a strong intramarginal vein.   (2)
2 (1) Corolla glabrous at throat; all parts densely tomentose   2 Aganosma cymosa
+ Corolla pubescent at throat; all parts glabrous or minutely pubescent, rarely tomentose.   (3)
3 (2) Corolla lobes 2.4-3.5 cm   3 Aganosma siamensis
+ Corolla lobes 0.4-1.6 cm.   (4)
4 (3) Corolla lobes obovate, apex rounded   4 Aganosma schlechteriana
+ Corolla lobes elliptic, apex acuminate   5 Aganosma breviloba

Lower Taxa


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