Meehan (1898: 25) lists the specimen as Potentilla anserina L. (Sp. Pl.: 495. 1753); Moulton (in press) reports it as Argentina anserina (L.) Rydb. (Mem. Dept. Bot. Columbia Coll. 2: 159. 1898). Neither Ertter (1993) nor Holmgren (in Cronquist et al., 1997) divides the herbaceous species into smaller genera, but based on data from Eriksson et al. (1998) we accept the segregate genus. The plant is known also as P. anserina var. grandis Torr. & A. Gray (Fl. N. Amer. 1: 444. 1840) or P. pacifica Howell (Fl. N.W. Amer. 1: 179. 1898). The specimen was collected near Fort Clatsop, Clatsop Co., Oregon, on 13 Mar 1806. Neither explorer mentions the plant although the label states "The roots are eat by the natives, & taste like Sweet Potatoes, grows in marshy ground." The specimen consists of some small roots and two fragments of immature leaves. Moulton (1991: 61) suggests that Lewis might have seen this species on 2 Apr 1806 as the expedition was moving up the Columbia River. The correct name for this taxon may well prove to be Argentina egedii (Wormsk.) Rydb. (in Mem. Dept. Bot. Columbia Coll. 2: 158. 1898) but for now we follow Ertter and Holmgren in defining A. anserina in a broad sense. (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:03/13/1806