Monoecious. Stems and branches striate, winged; wings 3 or 4, 1--2 mm wide. Winter bud scales inconspicuous. Leaves fascicled. Petiole 3--8 cm, winged; leaf blade pinnately 3-foliolate; petiolules narrowly winged, lateral ones 5--10 mm, terminal one 2.5--4 cm; leaflets elliptic, sometimes ovate to oblong, 5--12 × 3--7 cm, leathery, abaxially farinaceous green, pulverulently or papillately puberulous, adaxially olive-green and shiny, base rounded, slightly cordate, broadly cuneate, or sometimes subtruncate, margin revolute, apex acute, obtuse, short acuminate, or sometimes subrounded and mucronate; secondary veins 5 or 6 pairs, basal pair divergently ascending, others horizontally spreading. Racemes several to many, 1(or 2)-flowered; bracts persistent, inconspicuous; peduncle slender, 4--10 mm. Pedicel slender, 2--3 cm; bracteoles lanceolate, less than 1 mm. Outer 3 sepals lanceolate, 2.2--2.5 × ca. 0.6 cm, apex acuminate; inner 3 sepals narrower, ca. 2.1 cm. Petals lanceolate, ca. 2 mm. Male flowers: filaments connate into a tube; anthers free; connective apical appendage hornlike, equaling or longer than anther. Pistillodes subulate, concealed within filament tube. Female flowers: staminodes subulate, ca. 1 mm. Carpels clavate, 6--7 mm. Stigma lanceolate, reflexed. Fruit not seen. Fl. Nov--Dec.
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