印度血桐 yin du xue tong

Macaranga adenantha Gagnepain.

Trees 10-25 m tall. Branchlets yellowish brown pubescent when young; branches stout, glabrous, slightly glaucous. Stipules broadly ovate, acuminate, 1.5-2 × ca. 1 cm, pubescent, recurved, deciduous; petiole 11-14 cm; leaf blade ovate-orbicular, 14-25 × 13-23 cm, thinly leathery, abaxially pubescent and glandular-scaly, adaxially glabrous or pilose along veins, base rounded and broadly peltate, with glands, margin serrulate, apex acuminate; palmate veins 9. Male inflorescences branched, 10-15 cm, branchlets zigzag; bracts linear-spatulate, 4-7 mm, with 1-3 elliptic glands, or bracts minute, triangular. Male flowers many per bract; pedicel ca. 1 mm, pilose; sepals 3, ovate, ca. 1 mm, glabrous; stamens 5-7. Female inflorescences branched, 5-6 cm; bracts triangular, ca. 1 mm, pubescent. Female flower solitary; sepals 4, ca. 1.5 mm, pilose, persistent; ovary 1-locular; style 1, subulate, ca. 1.5 mm. Capsule globose, ca. 4 mm in diam., sparsely glandular-scaly; pedicel 3-4 mm, pubescent. Seeds smooth, black. Fl. Aug-Oct, fr. Oct-Nov.

Valleys, riverbanks, primary or secondary forests; 300-1900 m. Guangdong, Guangxi, SW Guizhou, SE Xizang (Mêdog), S Yunnan [Bhutan, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, Sri Lanka, Thailand, Vietnam].

The type of Trewia hernandiifolia Roth (Nov. Pl. Sp. 374. 1821) has not been located. The protologue suggests that it could provide an earlier epithet for Macaranga indica, which was published more than 30 years later.