金钩花 jin gou hua

Mitrephora trimera Craib, Bull. Misc. Inform. Kew 1913: 65. 1913; Pseuduvaria indochinensis Merrill.

Trees to 20 m tall, monoecious. Branches pale gray, densely puberulent when young, glabrescent. Petiole 3-11 mm, very densely puberulent; leaf blade obovate-elliptic to elliptic, 10-23 × 3.5-8.5 cm, thinly leathery, abaxially bluish green and glabrous, adaxially glossy and sparsely puberulent, secondary veins 10-12(-18) on each side of midvein and pubescent on both surfaces, base broadly cuneate to obtuse, apex acuminate. Inflorescences on young branches, in clusters of 3-6, each 1- or 2-flowered; peduncle inconspicuous; sympodial rachides short. Flowers unisexual. Pedicel 1-3 cm. Sepals ovate, 1-1.5 × 2-2.5 mm. Petals yellow; outer petals ovate, 2-3 × 1.5-3 mm; inner petals clawed-triangular, 5-8 × 3-5.5 mm, basal claw 2.5-5 mm. Male flowers: stamens 46-56. Female flowers: staminodes 7-9; carpels 7-14; ovules 5 or 6 per carpel, in 2 series. Fruiting pedicel 2-3 cm; monocarp stipes 1-1.4 cm; monocarps green, globose, 1.6-2.2 × 1.6-2.1 cm, densely puberulent. Seeds rugose. Fl. Feb-Apr, fr. Apr-Jul.

Evergreen and deciduous broad-leaved forests at base of limestone mountains; 200-700(-1500) m. S Yunnan [Myanmar, Thailand, Vietnam].