Lignum Vitae - Guaiacum sanctum
An evergreen tree with attractive purplish-blue flowers and opposite, pinnately compound leaves composed of pointed leaflets, Lignum Vitae grows in southern Florida, but is also widely planted as an ornamental. It is considered endangered in the wild. The common name is derived from the use of the resins for medical purposes, but the tree is perhaps best known for its dense, hard wood, reportedly so dense that it sinks in water. The wood is used for small, hard implements, including pins for sailing ships, clock gears, and cricket balls. The trunks are often gnarled.