Large liana, up to 20 m, 3 cm Ø. Leaflets 3-5, oblong elliptic, acuminate, chartaceous to coriaceous, often with a metallic hue above, base cuneate in degree, from sessile to not rarely narrowed to a pseudo-petiolule to 3 cm long; 6-18 by 3-11 cm; petiole 5-12 cm. Thyrses obviously axillary, or on old wood, 5-30 cm long. Pedicels ½-l¼ cm. Calyx cupular, not appressed to corolla, 4-7 by 6-7 mm, margin ± entire to shallowly lobed, glabrous, often with a few glands. Mature corolla 5-7 cm (incl. the lobes c. 1-2 by ½-¾ cm), tube 2½ cm wide at mouth, slightly curved, outside glabrous or papillose (except at base), purplish (see notes), lobes outside papillose or glabrous, with few to several dark glands or glandless, inside sometimes with long hairs; tube inside glabrous or with a few or a line of long hairs. Capsule 13-20 by 2½ cm, terete or oval in section, the valves woody. Seeds (incl. the wings) 4-5 by 1½ cm.
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