Shrubs or small trees. Leaf blade granular or subgranular in texture, glabrous, pubescent, or tomentose. Inflorescences leaf-opposed or extra-axillary and 1-flowered or fasciculate and several flowered. Flowers small, bisexual. Sepals 3, slightly smaller than petals, valvate. Petals 6, in 2 whorls, thick, sometimes outer and inner petals united at base forming a sympetalous corolla; outer petals small, valvate, spreading; inner petals larger than outer, sometimes connivent and erect, inside concave, base shortly clawed, margin adhering but later free, apically often incurved and valvate but occasionally imbricate. Stamens many; anther locules cuneate, extrorse; connectives apically broadly flat-topped to slightly concave. Carpels few to many; ovules 1 or 2 per carpel; styles very short; stigmas subcapitate to cuneate, grooved on top and down inner side. Fruit apocarpous; monocarps subsessile to stipitate, globose [or ovoid]. Seed often 1 per monocarp, rugose or pitted and with a circumferential ridge.
Shrubs or small trees, often climbing or scrambling, with simple (very rarely also forked or stellate) hairs.
Flower-buds broadly ovoid or depressed-globose.
Leaves rarely bearing 2 small basal glands.
Bracteole 1, persistent, on the lower half of the pedicel, sometimes foliaceous.
Flowers bisexual or more rarely unisexual, solitary or in 2- to many-flowered cymes, extra-axillary or occasionally axillary, sometimes on leafless branches, pedicellate.
Petals 6, in two ± unequal whorls, both valvate or rarely the inner imbricate, thick, free, the outer ± spreading at anthesis, the inner smaller, concave, often somewhat connivent and erect, usually shortly clawed.
Sepals 3, valvate, free or ± united, much shorter than the petals in bud, usually pubescent.
Carpels rather numerous to few (6), free; ovary clyindric or ellipsoid to obconic, with 1–4 (5) uniseriate ovules; style as long as the ovary or shorter, cylindric or obconic, oblique; stigma sub-capitate or tapering, often bifurcating.
Stamens 8 to few (6–8), cuneate-quadrate (rarely linear) or flattened and staminodial, with thecae extrorse, ± parallel, and connective broadened, with or without an obliquely capitate prolongation; filaments usually present, sometimes longer than the anthers.
Seeds vertical, serial; aril absent.