The airborne pollens of Walla Walla, Washington

A Pollen Survey: During the pollen seasons of 1975 and 1976 a total of 821 pollen samples were collected with a Rotorod sampler in and near Walla Walla, Washington. A total of 51 genera in 22 families were identified; most were also determined to species. A pollen chart was constructed to show the duration of pollen production of each taxon.