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Heterostemma sinicum

Description from Flora of China

Lianas woody, to 5 m, glabrous throughout. Branchlets grayish, thick, hollow, lenticellate. Petiole 2-3 cm; leaf blade ovate-oblong to oblong, 11-19 × 4.5-11 cm, thin papery, base rounded to truncate, apex acute; lateral veins 4 or 5 pairs, flattened. Inflorescences 8-13 cm; peduncle ca. 5.5 cm; rachis zigzag with 2 or more separated cymules; cymules with 2-5 flowers open, eventually racemelike. Pedicel 3-8 mm. Sepals triangular, ca. 1 × 1 mm; glands 10. Corolla brownish purple; tube ca. 1 mm long; lobes rotate, ovate-oblong, ca. 3 × 2 mm, longitudinally veined, mealy inside. Corona stellate spreading, apparently dark brown; lobes oblong-ligulate, ca. 1 mm, posterior angle obtuse. Gynostegium yellow tipped, constricted below apex. Anthers square, appendages rounded; pollinia circular to almost square. Stigma head subdepressed, obtuse. Fl. Jun.

* Mixed woods. ?Guangdong, Hainan.


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