Meehan (1898: 32) lists this as a "Bidens-like composite" that is too poor to identify. It is possible that this sheet is the basis for Pursh's association of a Lewis collection with Bidens mitis (Michx.) Sherff (see No. 36 above), but given the location discrepancies in print and on the label ("On Lewis's R. / Octbr: 1805") it seems unlikely. The taxon, known in the older literature as Coreopsis atkinsoniana Douglas ex Lindl. (in Edwards's Bot. Reg. 16: ad t. 1376. 1830), is mainly from along the Snake River in eastern Washington. The expedition encountered "Lewis's River" near Lewiston, Idaho on 10 Oct and arrived at the Columbia River ten days later. The plant is not mentioned in the journals (Moulton, 1988: 261-313). (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