The yellow markhamia is a species not well known to many people. Despite this, it is an excellent tree that produces clusters of yellow blooms throughout the year. It originates from East Africa and has a fast growth rate. In its natural habitat it can reach heights of 43 feet, but in a home or at a nursery, it generally only reaches about half that height.
(image found on flickr.com)
A tree from Asia, this beauty is a rare red form of the Markhamia stipulata (white). Once mature, this tree blooms on and off, sporadically throughout the year. A fast growing, medium size tree.
The Jerusalem thorn is a marvelous small tree. It blooms spring into summer covering the tree with a flush of small yellow flowers. The tree appears to be very brittle and delicate, but is doused with thorns from top to bottom. Great tree for coastal planting due to its high salt tolerance. It is also quite drought tolerant making it ideal for several varieties of landscapes.
A small evergreen tree with slightly fragrant white flowers. This species is rather tolerant of salt, making it an excellent choice for planting near the coast.
The grandiflora is a medium tree that can reach heights of 43 feet and it produces large pink flowers. After the flowers have dropped, long seed pods take their place. The tree grows fast, and like the Sesbania tripetii it needs to be trimmed to keep its shape.
The crista-galli is a tree often found in cooler gardens due to its ability to survive colder temperatures. It blooms throughout summer and fall and has a unique cork-wood bark to it. If there is a harsh winter, the tree will burn back, but as temperatures warm up, the tree will flush out again. High salt tolerance. 
The bidwillii is a cross between Florida’s native Erythrina (herbacea) and the Erythrina crista-gallii from South America. It has beautiful bright red blooms that appear in early spring. High salt tolerance.
The jatropha is very popular bush used for decorative landscape. The reddish pink flowers are seen year round and the plant is rather hardy. It has been grown from bushes to trees, and everything in-between. 
The jacaranda is highly used as an avenue tree. The tree is deciduous, but the vibrant display of violet-bluish flowers followed by the leaf drop is no match for naked branches. It is a spring bloomer and can withstand some cold. An excellent addition to the landscape.
Prized for its color-filled trunk, the rainbow eucalyptus is eye catching and exotic. The older it grows, the more colors the trunk reveals. As the bark peels, the newly green flesh shows and as it matures, it goes through a variation of colors leading the tree to display a rainbow of colors. High salt tolerance. 