Lepidium oleraceum is a herb in the family Brassicaceae, endemic to New Zealand. Its English common name is Cook's scurvy grass; Māori names include nau, ngau, naunau and heketara.Its specific epithet oleraceum means 'vegetable/herbal' in Latin and is a form of holeraceus (oleraceus).
There are three recognised varieties:
var. acutidentatum Kirk
var. serrulatum Thell.
In New Zealand it is native to coastal areas of the North and South Islands, Stewart Island, the Three Kings Islands, the Snares Islands, ...