Kadua coriacea of the Rubiaceae (coffee) family is a small shrub with leathery leaves that are elliptic to oblong in shape, 3 to 8 cm (1.2 to 3.1 in) long and 1.5 to 3 cm (0.6 to 1.2 in) wide. Flowers are arranged in clusters at the ends of the branches, a few flowers per cluster. The fleshy petals...