Allium crispum is a species of wild onion known by the common name crinkled onion. It is endemic to California, where it grows along the Central Coast in the Coast Ranges and in the Santa Monica Mountains, often in clays and serpentine soils.
Allium crispum grows from a bulb one to one and a half centimeters wide and sends up naked green stems topped with inflorescences of many flowers, each on a short pedicel. The flowers are magenta in color and have six triangular tepals. The inner three tepals are smaller and crinkled like cloth and may curl under. Anthers and pollen are yellow.