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FOC | Family List | FOC Vol. 16 | Apocynaceae

22. Trachelospermum Lemaire, Jard. Fleur. 1: t. 61. 1851.

络石属 luo shi shu

Lianas woody, latex white. Leaves opposite. Cymes lax, terminal, pseudoaxillary, or axillary. Flowers white or purplish, 5merous. Calyx small, deeply divided, basal glands 5-10, apex usually denticulate. Corolla salverform; tube cylindric, 5-angled, dilated at staminal insertion, throat constricted; lobes sharply overlapping to right. Stamens inserted at lower third of corolla tube; anthers sagittate, connivent, adherent to pistil head, anther tips included or exserted, cells spurred at base; disc scales 5, free. Ovaries 2, free, usually longer than disc; ovules numerous in each ovary. Style short; pistil head conical. Follicles 2, linear or fusiform, divergent or parallel. Seeds linear-oblong, not beaked, coma silky white; endosperm copious; cotyledons linear, flat, radicle short.

About 15 species: one in North America, the others in Asia; six species in China.

1 Anther apex exserted or slightly so   1 Trachelospermum asiaticum
+ Anther apex included or reaching corolla mouth.   (2)
2 (1) Corolla tube dilated at throat or middle.   (3)
+ Corolla tube dilated at base.   (4)
3 (2) Stamens inserted at corolla throat   2 Trachelospermum bodinieri
+ Stamens inserted at middle of corolla tube   3 Trachelospermum jasminoides
4 (2) Follicles divergent, linear, 3-5 mm in diam.   4 Trachelospermum brevistylum
+ Follicles parallel, cylindric to fusiform, 10-15 mm in diam.   (5)
5 (4) Leaves usually obovate or narrowly so; flowers purplish; ovaries and fruit glabrous   5 Trachelospermum axillare
+ Leaves oblong, narrowly ovate, or elliptic; flowers white; ovaries and fruit pubescent   6 Trachelospermum dunnii

Lower Taxa


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