Trees medium-sized, monoecious. Indumentum of solitary, simple hairs; no glandular scales. Leaves spirally arranged, paripennate, 3-7-jugate, without pseudo-stipules, glabrous, neither petiole nor rachis winged. Leaflets opposite to alternate; base equal-sided to oblique, in the latter case broadest at the acroscopic side; margin entire; nervation mainly open but somewhat irregular. Inflorescences terminal or pseudo-terminal, cymules many-flowered, bracts inconspicuous. Flowers unisexual, regular. Calyx urceolate, the narrow mouth surrounded by 5 minute lobes, densely tomentellous on both surfaces, not petaloid. Petals 5, included in the calyx, hardly clawed, sericeous on both sides, the margin sometimes slightly inflexed just above the base but without a clear scale. Disc annular, broad, adnate to the receptacle, glabrous. Stamens 5 (or 6), hardly exserted; filaments flattened, glabrous or with a few hairs; anthers adnate, glabrous, dehiscing introrse. Pistil sessile, 2-carpellate, divided to near the base, warty and densely hairy; stigma sessile, inserted between the lobes, 2-lobed Ovules 1 per cell, attached at the base. Fruits 2-parted, the parts obovoid, loculicidal, glabrous, densely aculeate, pericarp coriaceous, glabrous inside. Seeds attached basally, up to about halfway enveloped by a thin-fleshy ± entire arillode, hilum large, nearly orbicular.
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