29. Zanthoxylum dimorphophyllum Hemsley, Ann. Bot. (Oxford). 9: 150. 1895.
异叶花椒 yi ye hua jiao
Trees to 10 m tall, deciduous. Branches grayish black, with few prickles or unarmed; young branchlets and shoots rust-colored pubescent or glabrous; axillary buds rust-colored villosulous. Leaves 3-5(-11)-foliolate; leaflet blades ovate, elliptic, or sometimes obovate, (2-)4-9(-20) × (1-)2-3.5(-7) cm, oil glands numerous, midvein adaxially plane or impressed and puberulent, reticulate veinlets slightly ridged when dry, base symmetric, margin crenate and with or without spines, apex blunt, rounded, mucronate, or acuminate, usually with a retuse tip. Inflorescences terminal; bracts rust-colored villosulous. Perianth in 2 series with 4 sepals and 4 petals or grading to 2 irregular series or 1 series with 7 or 8 ± undifferentiated 2-3 mm tepals; when differentiated, sepals 0.2-0.5 mm and petals ca. 1.5 mm. Male flowers: stamens 4-6; disk pulvinate; rudimentary gynoecium obsolete or 2- or 3-carpelled. Female flowers: staminodes 4 or 5; rudimentary anthers without pollen; gynoecium 2- or 3-carpelled; styles recurved. Fruit follicles purplish red, 6-8 mm in diam., sparsely pubescent when young, with sparse oil glands, stipitate, apex shortly beaked. Seeds 5-7 mm in diam. Fl. Apr-Jun, fr. Sep-Nov. 2n = 36, 68.
Moist areas in upland forests, hillside open forests and thickets; 300-2400 m. S Gansu, N Guangdong, Guangxi, Guizhou, Hainan, SW Henan, W Hubei, Hunan, S Shaanxi, Sichuan, Taiwan, Yunnan [Thailand, Vietnam].
C. C. Huang (Fl. Reipubl. Popularis Sin. 43(2): 40. 1997) mistakenly placed Zanthoxylum dimorphophyllum in synonymy of Z. ovalifolium Wight, which ranges from India to NE Australia and is not known to occur in China.