The Texas sophora (Sophora affinis) belongs to Fabaceae (the Pea family). It is a semi-tall deciduous tree that is native to the central-southern United States, Arkansas and Louisiana west to Oklahoma and Texas. This tree grows on moist soils along streams and on limestone hills, and can reach about 9 m in height. The barks are gray-brown, thin and becoming furrowed. The leaves are pinnately compound with 13-19 elliptic leaflets. The papilionacenous, white tinged with pink flowers bloom in early spring. The fruits are black leathery pods and maturing in summer.