U.S.A., Wyoming, Natrona, North Platte River Valley: west side of North Platte River at Alcova, between Alcova Reservoir and Gray Reef Reservoir, ca 0.5 mi SE of Wyo Hwy 220; ca 27 air mi SW of Casper.
42.5549 -106.7277
42.5549° N, 106.7277° W; T30N R83W S24 E1/4 of NE1/4; also T30N R82W SW1/4 of NW1/4 and South1/2 of NW1/4 of NW
1616 meters
5300 ft.
Alkaline mud flats at edge of river and gravelly upland; soils moist, but not flooded; with Distichlis, Elymus repens, and Muhlenbergia.