Guaiacum angustifolium Engelm.

Guaiacum angustifolium Engelm.. Guaiacum angustifolium is a species of flowering plant in the caltrop family, Zygophyllaceae. Common names include Texas guaiacum, Texas lignum-vitae, soapbush and huayacán. It is native to southern and western Texas in the United States and northern Mexico. The specific name is derived from the Latin angustus, meaning "narrow," and -folius, meaning "-leaved".