Allium triquetrum is a bulbous flowering plant in the genus Allium (onions and garlic) native to the Mediterranean basin. It is known in English as three-cornered leek or three-cornered garlic, in Australia as angled onion[1] and in New Zealand as onion weed.[2] Both the English name and the specific epithet triquetrum refer to the three-cornered shape of the flower stalks.[3]
Allium triquetrum produces stems 17- tall, which are concavely triangular in cross-section. Each stem produces an umbel inflorescence of 4–19 flowers in January–May in the species' native environment.[4] The tepals are 10- long and white, but with a "strong green line".[5] Each plant has two or three narrow, linear leaves, each up to 150NaN0 long.[4] The leaves have a distinct onion smell when crushed.
Allium triquetrum is native to south-western Europe, north-western Africa, Madeira and the Canary Islands, where it grows in meadows, woodland clearings, on river banks and roadside verges from sea level to an elevation of .[4] It has also been introduced to Great Britain, Ireland, New Zealand, Turkey, Australia, California, Oregon, and South America,[4] and is a declared noxious weed in some of those places.[6] It has been recorded as an alien at a garden waste site on Howth Head, Ireland.[7]
All parts of the plant, from the bulb to the flowers, are edible fresh or cooked.[8]