老挝杜英 lao wo du ying

Trees 25-30 m tall. Branchlets silvery-gray puberulent, glabrescent. Petiole 0.8-2 cm, minutely puberulent, glabrescent; leaf blade oblanceolate, 6.5-11 × 2.5-3.5 cm, thinly leathery, abaxially pubescent on midvein only, adaxially glabrous, lateral veins ca. 10 per side, prominent abaxially, conspicuous adaxially, not glandular, base broadly cuneate or slightly obtuse, margin minutely serrate, apex slightly acute, acumen obtuse. Raceme 4-7 cm, 7-10-flowered; peduncle brown puberulent. Pedicel 4-7 mm, pubescent. Sepals 5, narrowly lanceolate, 8-10 × ca. 2 mm, abaxially gray-white puberulent, adaxially glabrous, margin tomentose. Petals 5, ca. 1 cm, abaxially appressed pubescent, adaxially velutinous, especially along keel, laciniate in upper 1/2; segments 17-20, adaxially white villous. Stamens 24-28, ca. 5 mm; filaments ca. 1 mm; anthers ca. 3 mm, with awn ca. 1 mm. Disk 10-lobed, apparently separated, glands globose, pilose. Ovary 3-loculed, pubescent; style 5-6 mm, pubescent in lower 1/2. Drupe shiny, ellipsoid, 1.2-1.4 × ca. 0.6 cm. Fl. May, fr. Dec.

Evergreen forests; 1300-1500 m. SE Yunnan [Laos].