Tree, 4-15 m. Leaves 3-pinnate, 60-80 cm; leaflets lanceolate-oblong, falcate-caudate, 5-8 by 2-3 cm, on both surfaces microscopically punctate but only with a few scattered, very small 'larger' glands; midrib and main nerves (c. 4-5 pairs) puberulous above (as in R. sinica). Inflorescences terminal, similar to those in R. sinica; peduncle firm, 15-35 cm long, rachis 4-7 cm; full-grown pedicels 2½-7 cm, halfway with 2 decussate linear bracteoles c. 1½-3 cm long. Bracts long, linear, exceeding the buds, the lowest up to 5 cm long, upper ones 2½-3 cm. Calyx campanulate, rather wide and thickish, densely microscopically lepi-dote, 2-2^2 by 1½ cm, rather irregularly lobed for ⅓-⅖ of its length, with 5 ± distinct gland fields. Corolla white or creamy, c. 6-7 cm long (incl. the ?entire lobes), with a rather wide (¾ cm) basal tube c. 1½ cm long concealed in the calyx on top of which the filaments are inserted; upper tube funnel-shaped widened. Filaments c. 3 cm, glabrous; anthers 4 ½ mm; connective appendage small. Ovary glabrous. Capsule terete, tortuous, 60-70 cm by 3-5 mm.
In Peninsular Thailand at 8°25' N, 99°15/ E, in evergreen forest along a stream, on limestone, at 50 m altitude, in the Cameron Highlands at 1200 m in mixed rainforest.
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