The type was collected along the banks of the Missouri River near Little Beaver Creek, Emmons Co., North Dakota, on 16 Oct 1804 (Moulton, 1987a: 470). However, Pursh gives the distribution as "Within the Rocky-mountains." As the label repeats the same line Pursh published regarding the height of the species ("never more than 6 inches high") we find it curious he placed the species in the mountains rather than on the plains along the Missouri River (The Lewis & Clark Herbarium Digital Imagery Study Set, ANSP, 2002) On deposit at the Academy of Natural Sciences, Philadelphia Collected by:Meriwether Lewis & William Clark Collection date:10/16/1804