Opa odorata Loureiro, Fl. Cochinch. 1: 309. 1790; Eu genia deckeri Gagnepain; E. millettiana Hemsley.

Trees, to 20 m tall, d.b.h. to 30 cm. Branchlets grayish brown when dry, slender, terete or slightly compressed. Petiole 3-5 mm; leaf blade ovate-lanceolate to ovate-oblong, 3-7 × 1-2 cm, leathery, abaxially olive green when dry, adaxially glossy and with numerous impressed glands, secondary veins numerous, ca. 2 mm apart, at an angle of ca. 45° from midvein, abaxially slightly raised, and adaxially inconspicuous, intramarginal veins ca. 1 mm from margin, base obtuse to broadly cuneate, apex caudate-acuminate. Inflorescences terminal or subterminal, paniculate cymes, 2-4 cm. Flower buds obovoid, ca. 4 mm. Hypanthium obconic, ca. 3 mm, corrugate when dry, glaucous. Calyx lobes 4 or 5, short, rounded. Petals white, distinct or coherent. Stamens and style very short. Fruit globose, 6-7 mm in diam., slightly glaucous. Fl. May-Aug, fr. (Sep-)Dec-Jan.

Sparse forests, broad-leaved evergreen forests in mountains, valleys, streamsides; below 100-400 m. Guangdong, Guangxi, Hainan [Vietnam].