The species of Cassia in this group have been documented to be naturally distributed over large geographic ranges from north-eastern India, southern China, mainland southeast Asia to the Philippines, and from Sumatra and Java (Indonesia) to New Guinea and possibly upper Queensland (Australia). They were generally recognized as varieties of Cassia javanica species complex before being reclassified into several different species and subspecies. A few species are somewhat restricted to specific natural habitats w hile the others have larger ranges with partially or fully overlapping geographic distributions. Most species have been extensively grown in tropical areas worldwide as a garden or street trees. Variants and/or intermediate forms likely exist in both nature and cultivation. In the latest classification , four accepted species and three subspecies have been recognized as listed below. Cassia javanica L. Cassia agnes (de Wit) K. Larsen Cassia renigera (Benth.) K. Larsen
Kukiat's Notes on Tropical Flowering Trees