Benzoin angustifolium (W. C. Cheng) Nakai.

Deciduous shrubs and small trees, 2-8 m tall. Young branchlets yellow-green, glabrous. Winter buds purple-brown, ovate; bud scales keeled, glabrous outside, sericeous-pubescent on dorsum, glabrous on inner surface. Leaves alternate; leaf blade elliptic-lanceolate, 6-14 × 1.5-3.5 cm, subleathery, pale and laxly pubescent along veins abaxially, green and glabrous adaxially, pinninerved, lateral veins 8-10 pairs, base cuneate, apex acuminate. Umbels 2 or 3, inserted at base of winter bud, male umbel 3- or 4-flowered, female umbel 2-7-flowered. Male flowers: pedicels 3-5 mm; tepals 6; fertile stamens 9. Female flowers: pedicels 3-6 mm; tepals 6; reduced stamens 9; ovary ovate, glabrous; style ca. 1 mm; stigma capitate. Fruits globose, ca. 8 mm in diam., black at maturity; stipes 0.5-1.5 cm, puberulent or glabrous; hypocarpium ca. 2 mm in diam. Fl. Mar-Apr, fr. Sep-Oct.

The leaves are processed for their aromatic oil. The seed oil is used for making soap and machine oil.

Thickets or sparse forests on mountain slopes. Anhui, Fujian, Guangdong, Guangxi, Henan, Hubei, Jiangsu, Jiangxi, Shaanxi, Shandong, Zhejiang [Korea].