What is "mescal bean"

n. A genus ((taxlink Dermatophyllum genus noshow=1), syn (taxlink Calia genus noshow=1)) of shrubs or small trees in the subfamily Faboideae of the pea family Fabaceae, native to southwestern North America from western Texas to New Mexico and Arizona in the United States, and south through http://en.wikipedia.org/wiki/Chihuahua, http://en.wikipedia.org/wiki/Coahuila and http://en.wikipedia.org/wiki/Nuevo%20Le%C3%B3n in northern Mexico.

n. shrub or small tree having pinnate leaves poisonous to livestock and dense racemes of intensely fragrant blue flowers and red beans [syn: coral bean, frijolito, frijolillo, Sophora secundiflora]