Trees or sometimes shrubs, to 25 m tall. Leaves 40-90 cm; petiole 5-23 cm; petiole and rachis sparsely to moderately glandular pubescent, occasionally densely so; leaflets (7 or)9-19, lateral ones sessile, blade elliptic to long elliptic or ovate-elliptic to long elliptic-lanceolate, 6-17 × 2-7.5 cm, abaxially tomentose or occasionally slightly pubescent, generally without glandular hairs, slightly to densely eglandular and glandular pubescent along midvein, base oblique, subcordate, margin serrate, rarely serrulate, apex acuminate; terminal petiolule 1-5 cm. Male spike 9-40 cm. Stamens 12-40. Fruiting spike with 5-10(-13) nuts. Nuts globose, ovoid, or ellipsoid, 3-7.5 × 3-5 cm; husk densely glandular pubescent, indehiscent; shell thick, rough, with 6-8 prominent ridges and deep pits and depressions. Fl. Apr-May, fr. Aug-Oct. 2n = 32
Mixed woods in humus-rich soils in valleys and inundated forests, also by mountain streams. Mixed forests on mountain slopes or in valleys at elevations from 500-2,800 metres.
Can be grown by seedlings. Seeds needs stratification.
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