New Zealand Spinach (Tetragonia tetragonoides)

A perennial trailing plant mainly grown as a half-hardy annual in the UK.  It is tolerant of high temperatures unlike regular spinach but is frost tender (although I have grown in a polytunnel in Devon as a self-seeding perennial with positive results).  An interesting triangular shaped leaf that is fleshy, succulent-like and slightly salty to taste.  Can be used as spinach (although unrelated) and its trailing habit makes for good ground cover.  High in oxalic acid - should be eaten in small quantities when raw.