缘瓣杜英 yuan ban du ying

Trees to 20 m tall. Branchlets slender, glabrous; buds pubescent, slightly gummy. Petiole 1-3.5 cm, slender, glabrous, adaxially grooved, swollen at end; leaf blade abaxially brownish or reddish brown, adaxially shiny, lanceolate, slightly curved, (4-)6.5-10 × (1-)2-3.5 cm, leathery, glabrous, abaxially densely glandular, adaxially sparsely black glandular, midvein prominently raised abaxially, impressed adaxially, lateral veins 6 or 7 per side, prominently raised, especially abaxially, veinlets prominent on both surfaces, glandular in axils of veins, base acute or nearly rounded, slightly oblique, margin crenate-serrate, reflexed, apex long acuminate, acumen obtuse. Racemes in axils of fallen and current leaves, 2-4.5 cm; peduncles pubescent, glabrescent. Pedicel 3-5 mm, puberulent. Flowers polygamous. Sepals 5, lanceolate, ca. 4 mm, abaxially puberulent, adaxially nearly glabrous. Petals 5, linear, ca. 3 mm, abaxially puberulent, adaxially pubescent, especially densely so at base, margin ciliate, entire or very shallowly 1- or 2-toothed. Stamens 10; anthers very shortly pilose, ca. 2 mm, not pubescent at apices. Fruit unknown. Fl. and fr. unknown.

Evergreen forests on slopes; 1200-2100 m. SE Yunnan [Laos].

This species is similar to Elaeocarpus chinensis but differs in having 5-merous flowers with 10 stamens, lanceolate, leathery leaves with crenate-serrate margins, conspicuous adaxial veinlets, and glabrous branchlets.