Tetragonia is a genus of 50-60 species of flowering plants in the family Aizoaceae, native to temperate and subtropical regions of the Southern Hemisphere, in New Zealand, Australia, southern Africa and South America. Common names include New Zealand Spinach, Kokihi (Māori language), Warrigal Greens, Sea Spinach, Botany Bay Spinach, Duneweed (South Africa), and Cook's Cabbage.

The genus, widely used by Māori and other

indigenous people as a leaf vegetable, was first mentioned by Captain Cook. It was immediately picked, cooked, and pickled to help fight scurvy, and taken with the crew. It spread when the explorer and botanist Joseph Banks took a viable plant back to London during the latter half of the 18th century.