Western pewter is also known as wool pewter. Deciduous tree, 10-20 meters high. Pinnate compound leaves, 79 leaflets, thin leathery, oblong-lanceolate, narrowly ovate or elliptic, 4-13 cm long, 2-8 cm wide, apex acuminate or acute, broadly cuneate at base, leaves The margin is inconspicuously serrate or nearly entire, yellow-green above, glabrous, and light green below.