Cladrastis tinctoria.

Botanical name: 

CLADRASTIS TINCTORIA, Raf. (Virgilio, Mx.) Yellow Ash, Fustic tree, Yellow Locust. From Kentucky to Alabama. Fine tree, wood yellow and soft, like Mulberry and Fustic, fine canoes made with it. The bark gives a bright yellow dye, it is laxative, and that of the roots purgative. Flowers fragrant, like Robinia. The turners use the wood, it is good for inlaying, it dyes pale yellow like Fustic.

Medical Flora, or Manual of the Medical Botany of the United States of North America, Vol. 2, 1830, was written by C. S. Rafinesque.