Millingtonia arnottiana Wight, Ill. Ind. Bot. 1: 144. 1840, based on Sapindus microcarpus Wight & Arnott, Prodr. Fl. Ind. Orient. 1: 112. 1834, not Ruiz & Pavón (1804); Meliosma pinnata (Roxburgh) Maximowicz subsp. arnottiana (Wight) Beusekom; M. pinnata var. arnottiana (Wight) Beusekom; M. wallichii Planchon ex J. D. Hooker.

Trees to 20 m tall, evergreen. Branchlets brown. Leaf axes, abaxial surface of leaves, and inflorescences sparsely curved pubescent or lanuginous. Leaves odd pinnate; petiolule 15-30 mm; leaflets 7-15, ovate on lower axis, oblong-ovate or narrowly oblong-elliptic at middle, narrowly elliptic at apices, 6-14(-17) × 2.5-4(-5.5) cm, subleathery, abaxially pilose or lanuginose, lateral veins 5-10 pairs, ascending, anastomosing 2-6 mm from margin, crinite at vein axils, base rounded or broadly cuneate, margin entire or spinously serrulate along upper margin, apex caudate-acuminate, tip usually curved. Panicle terminal or axillary by upper leaf of branches, 15-25 cm, axis triangular, branched 3 times, lateral branches flat. Pedicel 1-1.5 mm, pubescent. Sepals 5, ovate or suborbicular, ca. 1 mm, outer one narrower, ciliate. Petals light yellow: 3 outer ones flattened orbicular or orbicular, ca. 2 mm in diam.; 2 inner petals equal or slightly shorter than filaments, bifid to half at an obtuse angle, toothed at middle, lateral lobes ovate, ciliate. Stamens ca. 1 mm. Pistil ca. 1.3 mm; ovary pubescent; style equal to ovary. Drupe obovoid, 4-7 mm; endocarp convex, with coarse, scattered netlike strips, midrib obscurely prominent. Fl. May-Jul, fr. Aug-Oct.

Evergreen broad-leaved forests on mountain slopes, valleys; 500-2000 m. S Guangxi, Xizang, S Yunnan [India, Indonesia, Japan, S Korea, Malaysia, Nepal, Philippines, Sri Lanka, Thailand, Vietnam].