Lewis probably collected the type. On 17 Jul 1806 his party departed the Great Falls of the Missouri River in Cascade Co., Montana, and traveled overland northward in Chouteau Co. toward the Teton River. He was concerned about the potential threat of an unseen band of hunting Indians and camped early in the day on the banks of the Teton. Here he "ascended the river hills" (Moulton, 1993: 113) to make observations. Clark, on the other hand, was traveling by canoe down the Jefferson River mainly through Jefferson and Madison Co., Montana. He made landfall twice (Moulton, 1993: 177-179). Given that the specimens are in good flower (they lack roots but are hardly "imperfect"), it is likely that Lewis obtained them in the early morning at the Great Falls or late in the afternoon on the hills above the Teton. Neither explorer mentions gathering the species. The majority of the specimens on PH-LC 148 are probably garden specimens obtained from Fraser's Brothers Nursery, the seeds obtained by Nuttall in 1811. (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:07/17/1806