Lianas; younger stems weakly viscidulous and sharply 3-sulcate, the ribs prominently canaliculate, their margins prominently yellowish-hirtellous, the older stems prominently and irregularly 3-ribbed; wood simple. Leaves ternate-pinnately compound with 11 leaflets, to 25 cm long, the lowermost pair of seg-ments biternate; petioles 2.5-9.5 cm long, without wings, prominently canaliculate above, the lower rachis margined or narrowly winged, the wing 2-3 mm wide, the upper rachis prominently winged, the wing 5-10 mm wide, broadest near the apex, the marginal ribs of the petioles as well as the medial ridge and wing mar-gins of rachises densely long-hirsute; leaflets oblong-lanceolate or oblong-elliptic, abruptly acuminate or rarely acute at the apex, attenuate to acute at the base, 5-12 cm long, 2.5-4.7 cm wide, thin, crenate-dentate in the outer 2/3-1/2 with glan-dular teeth, sparsely hispid on the major veins beneath and on the margin and over the surface above, especially the midrib; stipules 1-2 cm long, prominently hispid-ciliate, otherwise glabrous. Inflorescences axillary, cauliflorous, or borne on ten-drils, the thyrses often solitary when borne in the leaf axils and on tendrils, glomerulate on older stems; rachises branched, glabrate or sparsely pubescent; bracteoles lanceolate, long-ciliolate; pedicels to ca. 4 mm long; pedicels and sepals sparsely appressed-pubescent to glabrous. Flowers white; sepals elliptic, glabrous, the outer ca. 1.5 mm long, the inner to 4 mm long; petals oblong-obovate, 4-4.5 mm long, glandular within, the anterior scales about as broad as long, 2.2-2.5 mm long, ciliate, the crest obovate, shorter than the deflexed appendage, the latter densely ciliate marginally; disc glands 2, oblong, short-villous outside; staminate flowers with the stamens to 2.5 mm long, the filaments villous, flattened, fused near the base, the pistil densely appressed-pubescent; bisexual flowers with the stamens to 2.5 mm long, the pistil to 4 mm long, the ovary densely appressed-pubescent, ca. 1.5 mm long, the style sparsely pubescent in the lower half, 3-branched in the upper fourth. Fruit not known.
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