The study consisted of a qualitative survey of airborne pollen on the native prairie. The study site is located T. 151 N., R. 52 W., Sec. 16, Oakville Township, Grand Forks County, North Dakota. Airborne pollen was obtained using the gravity slide method with a Durham Air Sampling Device from June 15 to August 15, 19^7* Gramineae and Chenopodiaceae pollen predominated with Urticaceae, Polygonaceae, Compositae, Pinaceae, and other pollen in lesser amounts
