Collected near Springfield, Bon Homme Co., South Dakota on 2 Sep 1804 (Moulton, 1987a: 469). (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:09/02/1804

Gathered above the Cheyenne River near the Sully-Potter Co. line in South Dakota on 3 Oct 1804 (Moulton, 1987a: 470). Pursh (1813: 522) gives the location as "On the plains of the Missouri. . . . Oct. Nov." (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:10/03/1804