Description from Flora of China
Barraldeia Thouars; Diatoma Loureiro; Karekandel Wolf; Petalotoma Candolle.
Shrubs or trees. Stipules lanceolate. Leaf blade margin entire or serrate. Inflorescences dichasial cymes. Bracteoles present. Calyx lobes 5-8, deltoid. Petals 5-8, conspicuously clawed. Stamens twice as many as petals, free, persistent, of 2 lengths, shorter ones opposite petals. Disk annular, fleshy. Ovary inferior, 5-8-loculed; ovules 2 per locule; style filiform; stigma discoid, capitate, or obscurely lobed. Fruit pulpy, 1-loculed. Seeds 1(-5), arillate, not viviparous.
About ten species: S and SE Asia, N Australia, Madagascar, New Guinea, Pacific islands: four species (two endemic) in China.