Pursh provides a detailed Latin description and gives the location as "On the Kooskoosky and Clarck's rivers" implying there might have been two collections. However, the same information is on the label of the only extant specimen. The date given on the label (1 Jun 1806) corresponds to a description of the species given by Lewis (Moulton, 1991: 323-324). Lewis writes that the specimen was gathered "on the steep sides of the fertile hills near this place," namely just northeast of Kamiah in Idaho Co., Idaho. Interestingly, Clark enters Lewis's description to his journal for 29 May. Clark states "we preserved a Specimene" (Moulton, 1991: 306). Whichever date is correct, the location is the same. The only Lewis and Clark specimen of this species we have found is the one on the American Philosophical Society sheet. Given this fact, the illustration published by Pursh was probably based on sketches made for Lewis by Pursh while the latter was still in Philadelphia. Pursh must have taken copies or perhaps even the original with him to London (Rossi & Schuyler, 1993). Clarkia pulchella is the type of Clarkia Pursh (Fl. Amer. Sept.: 256. Dec (sero) 1813), named for William Clark (1770-1838), co-captain with Lewis of the expedition. (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:06/01/1806