The Lewis and Clark sheet is without a date and according to label data the specimen was found on the "waters of the Kooskooskie." Given the state of the fragment, and a general lack of information, we believe the collection was made in the fall of 1805. If true then most likely the plant was found somewhere along the Clearwater River in late September or early October (Moulton, 1988). (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