October 18, 1804, along the Cannonball River, North Dakota.
Small clusters of white to deep pink flowers on dense prickly stems of new growth or on short, lateral branches of older stems. Flowers about 2 in (5 cm) wide. Fruit: bright red hip. Height: 2 ft (0.6 m).
Prairies, roadsides, and ditches.
Alberta east to Ontario and Massachusetts, southwest to Indiana and Texas, and northwest to Montana.