Strong and slender creeper or climber, up to 35 m long, stem up to 7½ cm diam., younger branches densely stellate-hirsute, older ones with low cork-ridges and without or with few oval lenticels. Leaves rigidly coriaceous, elliptic to obovate, 9-23 by 5-12½ cm, 12-15-nerved; rounded at the apex, obtuse to rounded, somewhat cordate at the base, with recurved margin; glabrous, with sunken midrib, nerves, and venation above; rather densely villose-hirsute, with slightly raised nerves and slightly sunken to faintly raised venation beneath. Petiole 7-12 mm. Inflorescences axillary, sometimes 2-4 together, up to 4 cm, up to 12-flowered. Pedicel 3-5 mm. Sepals 1 & 2 broadly ovate, 6 by 6.5 mm, 4 & 5 transverse-oval, 5 by 6 mm; densely stellate-hirsute outside (hairs with long and strong, up to 1500 µ long, central branch and 2-5 small, up to 100 µ long, basal branches). Corolla dark yellow, 10 mm, tube 4 mm; midpetaline field 6 by 4 mm, densely appressed-hairy (hairs with long and strong, up to 2000 µ long, central branch and 1-3 small, up to 50 µ long, basal branches). Lobules club-shaped, 2½ by 2 mm, near the apex 1.4 mm broad and 1 mm thick. Stamens inserted 2½ mm above the corolla-base; filament ½ mm long, 0.8 mm broad at the base; anther 0.8 mm long, 0.9 mm broad, 0.5 mm thick, obtuse at the apex, slightly cordate at the base. Ovary 1 by 1½ mm, densely hirsute; stigma conical, warty over the whole surface, with 5 faint ridges. Fruit flattened-ellipsoid, 29 by 24 by 19 mm, densely hirsute with up to 2 mm long hairs. Cotyledons plain.
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