United States, Minnesota, Washington, Washington Co.; along the St. Croix River, on the S side of Stillwater; SW1/4 SE1/4 sec.34, T30N R20W;;030N;20W;34
45.037677 -92.790656 +-338m.
On a sandy beach; assoc. species include: Echinochloa walteri, Eragrostis frankii, Hordeum jubatum