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FOC | Family List | FOC Vol. 16 | Asclepiadaceae

13. Calotropis R. Brown, Mem. Wern. Nat. Hist. Soc. 1: 39. 1810 (preprint).

牛角瓜属 niu jiao gua shu

Shrubs erect, canescent. Leaves opposite, broad, subsessile. Cymes extra-axillary or terminal, umbel-like, long pedunculate. Calyx with basal glands. Corolla bowl-shaped to subrotate, divided to middle; lobes valvate or overlapping to right. Corona lobes 5, adnate to gynostegium, fleshy, laterally compressed, apex with a tubercle on each side, with abaxial, basal, revolute spur. Filaments connate; anther appendages incurved; pollinia 2 per pollinarium, oblong, pendulous. Styles long; stigma head slightly convex. Follicles ovoid, subglobose, or oblong-lanceolate, mesocarp inflated.

Three species: northern Africa, Arabia, and tropical Asia; two species in China.

1 Flower buds cylindric; corolla 2.5-3.5 cm in diam., lobes long ovate or oblong, 1-1.5 cm, usually reflexed; corona shorter than gynostegium   1 Calotropis gigantea
+ Flower buds subglobose; corolla 1.5-2 cm in diam., lobes broadly ovate or ovate-triangular, 0.7-1 cm, not reflexed; corona as long as gynostegium   2 Calotropis procera

Lower Taxa


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