Zanthoxylum undulatifolium Hemsl.

Trees to 3 m tall. Young branchlets and leaf rachises rust-colored pubescent, with few prickles or unarmed. Leaves 3-5(-7)-foliolate; terminal leaflet with petiolule 6-10 mm, lateral leaflets subsessile; leaflet blades opposite, ovate to ovate-lanceolate, 3-8 × 1.5-3.5 cm, abaxially glabrous, adaxially sparsely puberulent, midvein adaxially plane, secondary veins 6-10 on each side of midvein, base broadly cuneate to rounded, margin undulate and crenulate, apex mucronate to acuminate. Inflorescences terminal, corymbose. Perianth in 2 irregular series or 1 series, with 5-8 ± undifferentiated tepals. Fruit pedicel reddish brown, 0.7-1.4 cm; follicles reddish brown, ca. 5 mm in diam., oil glands large and impressed, apex not beaked. Seeds ca. 4 mm in diam. Fl. Apr-May, fr. Aug-Oct.

W Hubei, S Shaanxi, E Sichuan, NE Yunnan.

● Forests, thickets; 1600-3200 m.