Small tree up to 2.5 m tall, trunk slender. Bark coarsely flaking or splitting to reveal a reddish or yellowish brown inner layer. Branches striate, ferruginous; new growth conspicuously striate, green, glutinous, lenticellate. Stipules in pairs, spinescent, 20-30 mm long, white, glabrous, slender, basally flattened, attenuate, pungent, antrorse, seldom arcuate, sometimes absent on new growth. Leaves fastigiate, shiny dark green, glabrous, glutinous when young, bipinnately compound, pulvinus vermilion at maturity; petiole sulcate, 5-15 mm long, with large, raised, crateriform, petiolar nectary gland; rachis sulcate, 20-90 mm long, with at least one nectary gland at junction of proximal and distal pinna pair; rachillae 3-6 pairs, distichous, 30-81 mm long, dotted with small dark glandular structures, with 8-16 leaflet pairs; leaflets distichous, narrowly elliptic, 6-15 x 2.4-3.0 mm, entire, eglandular, asymmetrical, apex mucronulate, base oblique, with conspicuous hyaline margin, midvein prominent on abaxial surface only, secondary veins not visible. Inflorescences capitate, globose, bright yellow, 10-22 mm diam., borne on new growth, fascicled on axillary peduncles; peduncle 70-90 mm long, glabrous or with few random, small dark glands, glutinous when young, often with shards of villose hairs; involucel bracteate, 1.0-2.2 mm long, 60-70 mm up the peduncle, 2 or 3 prominent, dark, gland-like tubercles usually present, remnants of a second involucel-like structure sometimes present ±10 mm below flowers. Flowers bright yellow, dichlamydeous. Bracteoles clavate with apices covered by waxy globules. Calyx campanulate, pentamerous, glabrous, 1.0-2.1 mm long, ascending, usually with a few pustular waxy globules, apex crenulated. Corolla campanulate, pentamerous, membranaceous; lobes ± united, calceiform 1.4-1.6 x 0.5-0.7 mm, ascending, edges and apex puncticulate, usually with few pustular waxy globules. Stamens numerous; filaments 2-3 mm long. Ovary ventricose, septate, 1-2 mm long, surface with a few pusticulate waxy globules; style 2-3 mm long. Pods dehiscent, complanate, eglandular, slightly falcate, 40-115 x 7-11 mm, 2-6-seeded, edges becoming constricted between seeds at maturity. Seeds elliptic, 6-9 x 4-7 mm, areole elliptic, 4-6 x 2-5 mm.
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