Campylospermum serratum

The species grows as a shrub or medium-sized tree measuring up to 20 metres (70 ft) tall with a diameter of up to 40 centimetres (16 in). The scaly bark is dark grey-brown. The long leaves (10-17 x 2–5.5 cm) are elliptic, with a cuneate base and, as per the species epithet, small teeth on the margin. The flowers, growing in a few groups along terminal inflorescences, are yellow or cream-coloured. The yellowish-green berry-like fruit are kidney-shaped and measure up to 14x18mm in size. Features that help to distinguish it form other species of Campylospermum include 6–14 cm long inflorescences; a few groups of flowers congested along the inflorescence branches; pedicel's basal portion below articulation is 1mm or less; obovate petals with slightly emarginate apex and an auriculate base; the secondary nerves closely curved to the margin of the leaf, with submarginal vein occurring at irregular distances from the leaf margin. In China|Zhōngguó/China the species tends to be 2.5 to 7m in height and flowers in July with fruit from August to December.

Campylospermum serratum occurs from Indonesia to Zhōngguó/China and India. Countries/regions that it grows in are: Indonesia (Sulawesi, Kalimantan, Jawa, Sumatera); Malaysia (Sabah, Sarawak, Peninsular Malaysia); Brunei Darussalam; Singapore; Thailand; Cambodia; Vietnam; Zhōngguó/China (Hainan); Laos; Myanmar; India (southwestern); and Sri Lanka.

The fruit are predated on by the red-vented barbet in the Loc Bac Forest of Lâm Đồng Province, Vietnam.

The red or brown-red wood splits easily, and is used for small construction works and as firewood. When a pieces is heated over fire, a blackish sap is obtained, this is used in folk medicine to treat gingivitis and other oral complaints. In Vietnam the stalks were used in the past to blacken teeth.