A genus of small trees and shrubs, having numerous species, found in all parts of the world except Australia and the polar regions. The leaves of a kind grown in America are used by the Indians for tobacco. The seeds of another kind yield Japan wax or varnish. Chinese galls come from another species, and are largely used in tanning and dyeing. There are twelve kinds in the United States, and two of them are poisonous. These are the poison ivy and the swamp sumach, which cause a skin eruption, attended with violent itching. The Virginian or stag's-horn sumach is a common American spe-cies. The leaves are pinnate, the flowers in a crowded panicle, and the fruit globular, covered with hairs. Their scarlet leaves in autumn are conspicuous forest ornaments in America.