Pursh (1813: 175) identifies this specimen as Claytonia alsinoides Sims (in Bot. Mag. 32: ad t. 1309. 1810), a synonym of C. sibirica, described from garden material grown from seeds gathered by Menzies during his visits to northwestern America on the Vancouver expedition. Meehan (1898: 20) lists the species as Montia sibirica (L.) Howell (in Erythea 1: 39. 1893). Coues (1898: 295) suggests the specimen was gathered in Multnomah Co., Oregon, "about 10 miles above Quicksand or Sandy River" near "Cape Horn." The site of Lewis and Clark's Cape Horn was across the river in Washington (Moulton, 1991: 14), and the expedition was there on 25 Mar. The label on the sheet written by Pursh only gives "Columbia R. / April. 8th- 1806." Accepting the date, one finds continued confusion as to just where the party camped on 7-8 Apr (Moulton, 1991: 89). The rocky point Coues identified as Cape Horn certainly is Beacon Rock in Skamania Co., Washington. Clark took a group across the Columbia River into Multnomah Co., Oregon. No mention is made of this plant in the journal of either explorer. (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:04/08/1806