Tree up to 26 m, scandent or erect, epiphytic or terrestrial shrub, or climber. Leaves mostly obovate, sometimes elliptic to oblong, rarely lanceolate, 7-60 by 2-30 cm, thin-to stiff-coriaceous, base acute, mostly long-attenuate, apex rounded to cuneate, nearly always acuminate, acumen tapering to abrupt, short and broad to fairly long and slender; nerves 3-15 pairs, usually slightly though distinctly prominent on both surfaces, rarely inconspicuous to invisible; petiole 0.5-4 cm, mostly robust, often narrowly winged, exauriculate; axillary scale for the greater part adnate to the petiole but distinctly broader, 4 mm-1.5 cm long, usually 2-lobed to truncate, rarely rounded. Inflorescences terminal with 2 strong branches in the upper leaf-axils, cymose to corymbose, lax to rather dense, (1-)7-c.50-flowered, sparsely to densely warty-lenticellate (still more conspicuously so in fruit); pedicels usually stout, 0.25-2.5 cm, 2-bracteolate in the lower two-thirds. Calyx cupular to campanulate, very slender to rather broad, 4-20 mm long, sepals connate for 1/3-2/3. Corolla-tube narrowly to widely funnel-shaped, 1.5-4 cm, lobes varying from about ⅓ to nearly as long as the tube. Anthers thickly ovate-oblong to lanceolate, 4-10 mm, to halfway bifid. Stigma capitate to peltate, 1-5 mm ø. Fruits either subglobular (sometimes beaked) and 3-4 cm ø, or spindle-shaped and 5-7 by 1¾-2½ cm, said to be black (Sumatra) or yellow (Philippines); calyx with loosely appressed to spreading or caducous lobes.
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