1. Engelhardia roxburghiana Wallich, Pl. Asiat. Rar. 2: 85. 1831.
黄杞 huang qi
Alfaropsis roxburghiana (Wallich) Iljinskaja; Engelhardia chrysolepis Hance; E. fenzelii Merrill; E. formosana Hayata; E. roxburghiana f. brevialata W. E. Manning; E. spicata Leschenault var. formosana Hayata; E. unijuga Chun ex P. Y. Chen.
Trees to 30 m tall. Leaves even-pinnate, 1-25 cm; petiole 1-8 cm, glabrous; rachis glabrous; leaflets 2-10, entire, petiolule 2-15 mm, blade elliptic-lanceolate to long elliptic, 4.5-14 × 1.5-5 cm, abaxially glabrous or puberulent, base oblique, apex acuminate or shortly acuminate. Nutlets globose, 3-5 mm, glabrous; wings glabrous, middle wing 1.5-5 cm, lateral wings 0.7-2.7 cm. Fl. Feb-Aug, fr. Jan-Dec. 2n = 32
Mixed broad-leaved or evergreen forests on loam, or on steep, dry slopes with sandy soil; 200-1500 m. Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Cambodia, Indonesia, Laos, Myanmar, E Pakistan, Thailand, Vietnam].
This species is widely distributed and highly variable, but the leaves, flowers, and nutlets are quite distinctive. Vegetative material can usually be distinguished by its entire, leathery, evergreen leaflets that are glabrous but coated with yellowish, peltate scales abaxially.