Pursh (1813: 521) cites Lewis material from "On the Missouri. . . . Aug.-Oct." The collection was made near the mouth of the White River in Lyman or Brule cos., South Dakota (Moulton, 1987a: 469). We are uncertain what Pursh had in mind when he proposed Artemisia santonica (see No. 19 above). (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:09/15/1804