Tetragonia tetragonoides

Tetragonia tetragonioides, commonly called New Zealand spinach, warrigal greens and other local names, is a flowering plant in the fig-marigold family (Aizoaceae). It is often cultivated as a leafy vegetable. It is a widespread species, native to eastern Asia, Australia, and New Zealand. It has been introduced and is an invasive species in many parts of Africa, Europe, North America, and South America. Its natural habitat is sandy shorelines and bluffs, often in disturbed areas. It is a halophyte and grows well in saline ground....read more on Wikipedia.