Allium unifolium Kellogg is found in moist grasslands from 16 to 720 m in the Coast Ranges of California into Oregon. It flowers from May to June. It is one of the most commonly grown Californian species as a landscape bulb and multiplies rapidly, partly because new bulbs are produced on lateral rhizomes from the outside of the previous bulb. Seeds are very viable and they spread throughout botanical gardens where they are planted. In spite of going by the common name, one leaf onion, this species has 2 to 3 flattish leaves and a many flowered umbel of pink flowers with pale pink filaments and deeper pink anthers. The first two pictures taken by Bob Rutemoeller show it in habitat on the Sonoma coast and a close-up too. The third and fourth were taken by Nhu Nguyen and the fifth by Michael Mace.
