Allium stellatum Fraser ex Ker Gawl.
Prairie onion is native to North American prairies.
Identification: Plants are 12-18" (30-45 cm) high, growing in sandy soil. Like all members of this genus, plants have a distinct onion/garlic odor. Leaves are few, grasslike, near the base. They die back when the flower stalks grow. Flowers are rose-pink to lavender, in umbels that are ball-shaped, 2-3" (5-7.6 cm) around. Each individual flower is about ¼" (6.3 mm) in size. Sometimes the flowerhead is tipped over—”nodding”—making these plants resemble nodding onion (Allium cernuum). Bulbs are oval or cone-shaped, 1½" (4 cm) × ½" (1.5 cm) in size.
Edibility: Bulbs are edible, but very strong in flavor, and can be eaten when boiled. The leaves are edible, either raw or cooked, and the flowers made a good garnish on salads.
Allium stellatum at Illinois Wildflowers
Allium stellatum on Missouriplants.com
Allium stellatum at the University of Wisconsin's Robert W. Freckmann Herbarium
Allium stellatum at the Lady Bird Johnson Wildflower Center
Allium stellatum on the USDA Plants Database
Allium stellatum on Plants for a Future, a resource and information centre for edible and otherwise useful plants
Allium stellatum description by Thomas H. Kent, last updated 15 Oct 2013.