Lignum vitae
Guaiacum sanctum

Native to the Florida Keys.  This small tree has a very hard wood which withstands hurricanes easily.  The growth is more wide than tall and can reach 20 or more feet tall.

The one inch blue flowers are followed by a yellow round pod that contains black seeds covered by a deep red aril. The lyside sulfur butterfly larvals on this plant and catbirds eat the fruit.

 Can grow in dry soils with some organic matter up to Palm Beach County and will tolerate some salt air yet no salt water flooding.  Surprisingly tolerant of cold air down to near freezing.

 Lignumvitae has a truck like a bonsai and can live for hundreds of years.  The wood is full of resin and was once used for the bearings of boat propeller shafts due to its self lubricating properties.  Growth rate is about two feet a year.