Guaiacum angustifolium is a species of flowering plant in the caltrop family, Zygophyllaceae. Common names include Texas Guaiacum, Texas Lignum-vitae, Soapbush and Guayacán. It is native to southern and western Texas in the United States and northern Mexico. The specific name is derived from the Latin words angustus, meaning "narrow," and folius, meaning "leaf."
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