PLANT: Sparsely branched shrubs or small trees, to 3 m tall; bark gray, lenticular; twigs gray, puberulent to glabrate. LEAVES: evergreen, petiolate, odd-pinnately compound, 5-9 foliolate; petiole to 2 cm long; leaflets petiolulate to subsessile, lanceolate or elliptic to ovate, 25-50 mm long, 10-25 mm wide, entire, leathery, dull green above, paler and puberulent to glabrate beneath; apices acute to acuminate; bases cuneate to rounded (sometimes obliquely). INFLORESCENCE: open panicles, to 8 cm long and 15 cm wide, terminal and axillary, puberulent; bracts lanceolate, pubescent, to 2 mm long. FLOWERS: to 5 mm long; sepals ovate, olivegreen, glandular puberulent; petals cream, glabrous. FRUIT: lenticular-orbicular, to 6 mm in diameter, orange, glandular pubescent, wrinkled in dried specimens. NOTES: Dry, often rocky hillsides, steep slopes, and canyons, upper edge of the Chihuahuan Desert to semidesert grassland, chaparral, oak woodland, and as understory along washes and riparian zones: Cochise, Pima, and Santa Cruz cos.; 1100-1870 m (3600-6000 ft); Aug-Sept (fruits may persist overwinter); se AZ, s NM, w TX and n Mex. AZ material has been called Rhus choriophylla Wooton & Standley (Type: Guadalupe Canyon, on the Mexican boundary, near the southwest corner of New Mexico, Mearns 699, US) based on fewer, larger, and glabrous leaflets and axillary as well as terminal inflorescences (Wooton and Standley 1913; Barkley 1937); but, it has been considered a weak variety (Vines 1960; Shreve and Wiggins 1964; Correll and Johnston 1970). These morphological characters are not consistently present in AZ specimens; therefore, AZ material is best treated as the far w portion of the range of Rhus virens Lindh. and not a separate taxon. REFERENCES: John L. Anderson, 2006, Vascular Plants of Arizona: Anacardiaceae. CANOTIA 3 (2): 13-22.