1. Alchornea rugosa (Loureiro) Müller Argoviensis, Linnaea. 34: 170. 1865.
羽脉山麻杆 yu mai shan ma gan
Shrubs or small trees, 1.5-5 m tall, dioecious. Branchlets pubescent when young, becoming glabrous. Stipules subulate, 5-7 mm; petiole 0.5-3 cm; leaf blade cuneate-obovate or elliptic to broadly lanceolate, 10-21 × 4-10 cm, thickly papery, base obtuse or slightly cordate, with 2 glands, stipels absent, margins serrulate, apex acuminate; venation pinnate, lateral veins 8-12 pairs. Inflorescence terminal, branched, 7-25 cm, puberulent or glabrous; bracts triangular, ca. 1.5 mm, base usually with 2 glands. Male flowers 5-11 per bract; pedicel ca. 0.5 mm; buds globose, ca. 1 mm in diam., pilose; sepals 2-4; stamens 4-8. Female flowers: pedicel ca. 1 mm, pubescent; sepals 5, triangular, pubescent; ovary densely puberulent; styles 3, filiform. 3.5-7 mm. Fruiting pedicel ca. 2 mm; capsule 3-lobed, ca. 8 mm in diam., subglabrous. Seeds ovoid, ca. 5 mm, brownish, verrucate. Fl. and fr. year-round.
Forests; below 600 m. Guangdong, Guangxi, Hainan, Yunnan [India (Nicobar Island), Indonesia, Malaysia, Myanmar, New Guinea, Philippines, Thailand; N Australia].
