Sophora howinsula, commonly known as lignum vitae or Lord Howe kowhai, is a flowering plant in the legume family. The specific epithet refers to the island to which the species is endemic.
It is a tree, growing to 10 m, sometimes 15 m, in height. The wood is hard and durable and was used for house stumps and fence posts. The pinnate leaves are 5âÂÂ10 cm long. The 1.5âÂÂ2 cm long yellow pea flowers are produced in racemose inflorescences. The 7âÂÂ12 cm long pods each contain 5âÂÂ10 smooth, orange-brown, ellipsoidal, 7 mm long seeds. The flowering season is from mid-July to mid-September.
The plant is endemic to AustraliaâÂÂs subtropical Lord Howe Island in the Tasman Sea. It has a locally common, scattered distribution through the island's lowland hills.