quassia wood

…of species of the genera Quassia and Picrasma yields quassia, a bitter substance used in medicines. The crucifixion thorn (Castela emoryi) is native to the deserts of the southwestern United States.

…wood of Quassia amara (quassia wood) are used in tropical America to make an antimalarial tonic. This species is widely cultivated for its red flowers and bitter bark. Likewise, bitters are prepared from the bark of Simaba cedron in Central America and Picrasma excelsa (Jamaica quassia) in the West…