Cratoxylum is a genus of flowering plants in the family Hypericaceae, placed in the order Malpighiales. It was described by the Dutch botanist Carl Ludwig Blume in 1825 and comprises around seven accepted species, all native to tropical Asia.
Plants in this genus grow as shrubs or small to medium-sized trees. The bark, which turns black on drying, produces a characteristic yellow resinous sap — a feature shared with other members of the Hypericaceae. Flowers are white or pink to crimson, and the fruits are ellipsoid capsules that split into three valves at maturity.
The genus is distributed from India through southern China and into Malesia — the biogeographic region encompassing the Malay Peninsula, Indonesia, the Philippines, and surrounding islands. Notable members include Cratoxylum cochinchinense, Cratoxylum formosum, and Cratoxylum neriifolium.
Etymology
The generic name Cratoxylum derives from Greek roots meaning "strong wood," a reference to the hardness of the timber produced by species in this genus. An orthographic variant, Cratoxylon Blume, appears in some older literature and refers to the same group.
Distribution
Cratoxylum species grow naturally from India eastward through southern China and into Malesia, encompassing the Malay Peninsula, Sumatra, Borneo, the Philippines, and adjacent islands. The genus is confined to tropical Asia and does not occur in Africa or the Americas.
Taxonomy Notes
Cratoxylum was described by Carl Ludwig Blume in 1825 (published in Verhandlungen van het Bataviaasch Genootschap 9: 174). The genus is placed in Hypericaceae (order Malpighiales), a family sometimes treated as a subfamily of the broader Clusiaceae in older classifications. The orthographic variant Cratoxylon Blume is treated as a synonym. Plants of the World Online recognised seven species as of December 2023.
