in taxon plant used for medicine lignum-vitae plant PLANTS:GUOF Guaiacum officinale, commonly known as roughbark lignum-vitae, guaiacwood or gaïacwood, is a species of tree in the caltrop family, *Zygophyllaceae*, that is native to the Caribbean and the northern coast of South America. [https://en.wikipedia.org/wiki/Guaiacum_officinale] gaïacwood guaiacum officinale guaiacwood roughbark lignum-vitae Guaiacum officinale requires discussion