Amongst Rubiaceae, Cinchoneae with some outliers in the Old World have their headquarters at cooler levels.
The principal orders, arranged according to their numerical importance, are as follows: - Leguminosae,Rubiaceae, Orchidaceae, Compositae, Gramineae, Euphorbiaceae, Acanthaceae, Cyperaceae and Labiatae.
The flora includes mangroves, Rubiaceae, Sapotaceae and other forms requiring more than pure coralline material for their growth.
Irritability resides in the pulvinus,in the pea and bean family, in rosaceous plants and the family Rubiaceae.
foliar stipule, as in members of the family Rubiaceae.