肿柄杜英 zhong bing du ying

Trees to 15 m tall. Branchlets yellow-brown puberulent, glabrescent and yellow-brown tomentose. Petiole 1.5-3 cm, swollen at both ends, nearly glabrous; leaf blade obovate-lanceolate, broadly lanceolate, or oblong, tapered toward base from middle, 11-19 × 4-6 cm, nearly membranous, both surfaces glabrous or puberulent on midvein, lateral veins 6 or 7 per side, prominent abaxially, slightly impressed adaxially, veinlets inconspicuous on both surfaces, base cuneate or obtuse, margin shallowly crenate, apex acuminate, acumen obtuse. Racemes in axils on two-year-old branches, ca. 8 cm; peduncles puberulent. Pedicel ca. 5 mm. Flowers bisexual. Sepals 5, ca. 5 mm, gray-white pubescent abaxially, glabrous adaxially. Petals 5, obovate, glabrous, laciniate in upper 1/2; segments ca. 30. Stamens 34 or 35, fascicled; anthers not awned but pubescent at apices. Disk 5-lobed. Ovary pubescent, 3-loculed; ovules 2 per locule. Drupe ellipsoid, ca. 3.5 × 2.2 cm; exocarp black when dry, glabrous; endocarp bony, ca. 3 mm thick, shallowly lacunose. Fl. Mar-Apr, fr. Apr-May.

Evergreen forests; 1500-1800 m. NW Yunnan [N Vietnam].