[5] Both the English name and the specific epithet triquetrum refer to the three-cornered shape of the flower stalks.

[6] Allium triquetrum produces stems 17–60 cm (6+3⁄4–23+1⁄2 in) tall, which are concavely triangular in cross-section.

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 850 metres (2,790 ft).

[7] It has also been introduced to Great Britain, Ireland, New Zealand, Turkey, Australia, California, Oregon, and South America,[7][9] and is a declared noxious weed in some of those places.

[10] It has been recorded as an alien at a garden waste site on Howth Head, Ireland.