Description from
Flora of China
Pygmaeopremna Merrill.
Trees, shrubs, or subshrubs, erect or rarely climbing. Branches usually terete, usually with round or elliptic yellowish glandular lenticels. Leaves simple, opposite, margin entire or 3-5-crenate. Inflorescences terminal trichotomous panicles, leaf opposed cymes, clusters, paniculate corymbs, or spikelike thyrses. Flowers small. Calyx ± cup-shaped or campanulate, truncate, sinuately dentate, or rarely long dentate, teeth equal or clearly 2-lipped. Corolla with a short tube; lobes 4 or obscurely 5, spreading, subequal to clearly 2-lipped. Stamens 4, often didynamous, shorter than corolla or sometimes slightly exserted. Ovary (2- or) 4-locular; ovules 1 (or 2) per locule, pendulous or laterally attached. Style capillary; stigma 2-cleft. Fruit a small drupe, usually with a 4-locular pyrene.
About 200 species: Old World tropics and subtropics, 46 species in China.