Rubiaceae : Gamopetalae  

The fourth largest family of flowering plants, with 600–650 genera and more than 13,000 species. A predominantly tropical family with a few genera in temperate regions; 217–220 genera and more than 5,000 species in the Neotropics. These are most commonly terrestrial, rarely epiphytic, rheophytic, semi-aquatic (amphibious) or aquatic, presenting a wide range of habits, such as herbs, shrubs, small to large trees, and herbaceous to woody climbers. Climbers are represented by 31 genera and a total of 259 species occurring in a wide range of habitats, including moist, wet or dry forests, scrublands, savannas, and sometimes open disturbed biomes