Climber up to 5 m high. Branches obscurely sulcate or slightly angular, c. 3 mm ø. Leaves chartaceous, deeply 3-lobed (broadly hastately 3-lobed when young), 10-23 by 10-30 cm; base cuneate; glabrous on both surfaces; middle lobe oblanceolate, 8-18 by 2-6.5 cm, acuminate; lateral lobes spathulate, slightly incurved, 6.5-14 by 2.5-5.5 cm, rounded at the apex; nervation pedately flabellate, 3-nerved at the base; outer nerves at first along the margin, then giving off: a) 2 interior nerves to the central lobe and each of them ascending upwards to the apex, and b) often 2 exterior nerves for each of the outer lobes, respectively, extending to the apex; midrib and nerves elevated and prominent beneath, rather less so above; veins loosely transverse and reticulate, distinct beneath, rather faint above; petiole 5-10 cm, subterete. Inflorescences in the axils of foliage leaves, 1-3, spiciform, up to 6.5 cm long, glabrous, internodes distinct; bracts amplexicaul, conspicuous, reddish, ovate to lanceolate, 7-10 (-15) mm long, glabrous. Pedicel and ovary 6-8 mm long, glabrous. Perianth blue and crimson, straight, with obscure venation, glabrous; utricle ellipsoid, 20 by 8 mm; tube cylindric, 10 by 1 mm; limb 1-lipped, linear, 20 by 1 mm. Stamens 6, filaments with very small anthers. Style column very short, 6-lobed. Capsules oblong, 3-4 by 1.5 cm, obscurely 6-ribbed, obtuse. Seeds broad-ovate, not winged, c. 5 by 4 mm, granular on both surfaces, funicle spindle-shaped, c. 4.5 by 2 mm.
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