Guaiac

Guajacum officinale, also called guaiac or pockwood, is a plant genus within the family of the zygophyllaceae. It includes up to eight tree species from the tropical and subtropical regions of America.

Guajacum species are trees or shrubs with very hard, resin-rich wood. Their leaves are arranged oppositely and have 4 to 28 leaflets.
The flowers of Guajacum officinale grow singly in the leaf axils of the plant. They are blue, purple, or white in color. In addition, the flower has four or five sepals.

Guajacum officinale is the source plant for Guajaci lignum(Lignum Guajaci), or guaiac wood.