North Dakota designated the wild prairie rose (Rosa blanda or Rosa arkansana) as the official state flower in 1907. Found growing along North Dakota roadsides, in pastures, and in native meadows, the wild prairie rose has five bright pink petals with a cluster of yellow stamens in the center. Iowa also recognizes the wild prairie rose as state flower.

The rose has been around for about 35 million years and grows naturally throughout North America. The petals and rose hips are edible and have been used in medicines since ancient times.

Rose hips (the fruit of the rose which forms at base of the flower) are a nutritional treasure chest - rich in vitamins (C, E, and K), pectin, beta-carotene, and bio-flavinoids. These elements produce a strong antioxidant effect which protects and enhances the immune system. Rose hips improve blood cholesterol and pressure, digestive efficiency, and weight management (and are also a special winter treat for birds and wild animals).

Source:

State Flower: ND.gov - North Dakota's Official Portal

Links:

State Flowers - 50 States List
National Flower