心叶西番莲 xin ye xi fan lian

Herbaceous vines, 2-3 m long. Stem terete, pubescent. Petiole (2-)5-6 cm, pubescent, with two large discoid glands at base; leaf blade broadly ovate, ca. 15 × 12 cm, membranous to leathery, puberulous to densely pubescent, abaxially with 20-50 small scattered laminar nectaries, base cordate, margin entire, apex acute or shortly acuminate. Inflorescences (sub)sessile, 15-20(-30)-flowered. Pedicel 1-2 cm. Flowers white, 1-1.5 cm in diam. Sepals ca. 6 × 3 mm, awn 1.5-2 mm, pubescent. Petals ca. 5 × 2 mm. Corona in a single series, 1.5-3 mm; operculum plicate, ca. 1.2 mm tall, membranous; disk absent; androgynophore ca. 2 mm tall. Stamens 5; filaments ca. 2.5 mm, free; anthers ca. 2.5 × 0.7 mm. Ovary sessile on androgynophore, obovoid, pubescent; styles 3, free, 2-2.5 mm. Fruit globose, 1.5-1.8 cm in diam., densely pubescent. Fl. Feb-May, fr. Jun.

Forests on limestone hills; ca. 1200 m. W Guangxi (Jingxi), SE Yunnan (Xichou) [Vietnam].