Liana, up to 15 m high. Branches subterete, 3-6 mm ø, glabrous. Leaves chartaceous, elliptic, 10-15 by 5.5-8 cm; apex shortly acuminate; base rounded or obtuse, rarely slightly concave; glabrous above, minutely hairy beneath especially on the venation; basal nerves 2 pairs, the inner pair and the midrib elevated, prominent beneath, distinct above, ascending obliquely and slightly curved nearly reaching the apex of the blade; outer pair of basal nerves rather weak, running along the margin; the longitudinal nerves joined by 10-14 loosely transverse or slightly curved nervules or stronger veins, slightly elevated beneath, distinct or faint above; veins and veinlets loosely reticulate, distinct or faint on both surfaces; petiole c. 3 cm, glabrous. Flowers (detached) cauligerous, on brachyblasts, internodes condensed, obscure; bracts lanceolate or lineate, 3-4.5 mm long, shortly hairy on both surfaces. Pedicel and ovary c. 3 cm long, glabrous. Perianth dull yellow with dark purple stripes and markings, curved, distinctly longitudinally 6-nerved or-veined, glabrous outside; utricle subglobose, 10-12 by 9-10 mm, abruptly contracted and collar-like at the base, densely hairy inside, with 2 ellipsoid, glandular bodies (3-4 mm long); tube often at right angles with the utricle, cylindric, c. 15 by 3 mm, glabrous inside; limb 1-lipped, ovate-oblong or lanceolate, naviculiform in side view when young, 60-90 by 30-35 mm, longitudinally incurved, inner surface almost glabrous, except sparsely short-hairy at the basal part. Stamens 6; anthers oblong, c. 1 mm long. Style column c. 3.5 mm long, 6-lobed, with an annular ring at the base; lobes triangular, c. 1.5 mm long. Capsules unknown.
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