Olacineae
An order of erect, climbing, or twining shrubs or trees, very rarely suffruticose or sub-herbaceous, dispersed over the tropical and sub-tropical regions of the globe, a few growing in South Africa or extra-tropical Australia. Flowers greenish, yellowish, or white, rarely purplish, generally small; calyx four or five (rarely six) toothed, lobed, or parted; petals four, five, or rarely six, free, or coalescing in a campanulate or tubular corolla; inflorescence cymose, racemose, or paniculate. Fruit usually drupaceous, one-seeded. Leaves alternate, or rarely opposite, entire or occasionally toothed, often penninerved; petioles usually flexuous; stipules none. The order includes thirty-six genera and about 170 species. Examples: Heisteria, Icacina, and Olax.