A plant family of the order Sapindales, subclass Rosidae, class Magnoliopsida which is a small family of small trees and shrubs growing in arid and warm regions.
Guaiacum
A plant genus of the family ZYGOPHYLLACEAE. GUAIAC is obtained from G. officinale or G. sanctum. Some species in this genus are called lignum vitae which is also a common name for other trees.