Colubrina oppositifolia of the Rhamnaceae (buckthorn) family, a tree 5 to 13 m (16 to 43 ft) tall, has opposite, stalked, oval, thin, pinnately veined, toothless leaves with glands on the lower surface. Leaves measure 6 to 12 cm (2.4 to 4.7 in) long and 3 to 7 cm (1.2 to 2.8 in) wide in mature...