Toxocarpus kleinii

Twiner; branchlets puberulous. Leaves decussate, elliptic to obovate, to 8 x 4 cm, subcoriaceous, puberulous below, base obtuse, apex short-acuminate; petiole to 1.5 cm. Cymes dichasial, lax; peduncle to 3 cm, puberulous; bracts lanceolate, 3 mm; pedicel 0.5 cm. Calyx-lobes 5, ovate, 4 mm, rusty puberulous without. Corolla broad-campanulate, cream, 1 cm wide; lobes 5, oblong, 1 cm, recurved, overlapping to left in bud. Corona 1, of 5 erect, dorsally flattened segments attached to staminal column. Stamens 5; connective produced above; pollen masses 2 per cell, ascending. Style apex elongate, longer than staminal column. Follicles paired, elongate, fusiform, 15 x 1 cm; seeds oblong, 1.5 x 0.6 cm; coma silky.

References:

The Plant List Ver.1.1 (Unresolved) Dinesh Valke’s Flickr Post  Flowers of India  India Biodiversity Portal  IBIS Flora Kerala Plants  An Excursion Flora of Central Tamilnadu, India By K. M. Matthew (1995- Details) 
Plant illustrations  Herbarium Catalogue