轮苞血桐 lun bao xue tong

Macaranga bracteata Merrill; M. brandisii King ex J. D. Hooker; M. esquirolii (H. Léveillé) Rehder; M. kampotensis Gagnepain; M. rosuliflora Croizat; M. trigonostemonoides Croizat; Morinda esquirolii H. Léveillé.

Shrubs 1-5 m tall. Branchlets pubescent, glabrescent. Stipules elliptic, 3-5[-8] mm, chocolate brown, apex subulate, deciduous; petiole 2-4 cm, pilose; leaf blade oblong-lanceolate or oblong, 7-14 × 2.5-5.5 cm, thickly papery, often drying dull brown, abaxially sparsely dark glandular-scaly, midrib pilose, base slightly auriculate-cordate, with 2 glands, margin sparsely glandular-denticulate, apex acuminate; veins 5-8 pairs. Male inflorescences very slender, (1.5-)4-9 cm; peduncle slender, 0.5-2 cm; axis glabrous or pilose; bracts deltoid, ca. 1 mm. Male flowers tiny, 3-5 per bract, surrounded by persistent whorl of 3 or 4 hooded bracteoles; pedicel ca. 1 mm, pilose; sepals 3, ovate, ca. 1.5 mm, glabrous; stamens 20-22. Female inflorescences often 1-flowered, sometimes inflorescence bisexual, with 1 or 2 male flowers; peduncle slender, 3-9 cm; flower subtended by pair of leafy bracts. Female flowers: pedicel 1-2 mm; sepals 4, lanceolate, 2-3 mm, pilose; ovary 2-locular; styles 2, filiform, 1.2-1.4 cm, basally connate. Capsule 2-lobed, ca. 5 × 11-12 mm wide, densely glandular-scaly, with sparse long sinuous caducous spines. Seeds subglobose, ca. 5 mm in diam., brownish, marbled. Fl. and fr. year-round.

Hills, mountain valleys, thickets; 100-400 m. Guangdong, Guangxi, Guizhou, Hainan, S Yunnan [India (Andaman Islands), Malaysia, Myanmar, Thailand, N Vietnam].