The Lewis sheets consist of a single leaf each gathered along the lower Columbia River between Puget's Island and the Cowlitz River on 26 Mar 1806. Both explorers mention the species on numerous occasions (Moulton, 1988, 1990). (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:03/26/1806

Gathered along the lower Columbia River between Puget's Island and the Cowlitz River on 26 Mar 1806. Both explorers mention the species on numerous occasions (Moulton, 1988, 1990). (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:03/26/1806

Lewis (16 Sep 1804) gives a brief description of this species (Moulton, 1987a: 76-77) about which Meehan (1898: 41) states: "The travellers were not botanists, but a specialist could not have drawn a better description . . . ." Lewis 34 was gathered on 5 Sep near Verdel, Knox Co., Nebraska (Moulton, 1987a: 469). PH-LC 189 is a mixed collection. The two larger leaves on the lower half of the sheet are probably the leaves gathered by Lewis. Nuttall probably collected the flowering material and two leaves on the upper half of the sheet in the spring of 1811. On the label, Pursh says the fragments were found on the "Mississippi" although in print he lists "Missouri" as one of the numerous locations for the species. There is no indication of any Lewis collection from along the Mississippi River among his lost specimens (Moulton, 1987a: 450-472). (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:09/05/1804

Lewis (16 Sep 1804) gives a brief description of this species (Moulton, 1987a: 76-77) about which Meehan (1898: 41) states: "The travellers were not botanists, but a specialist could not have drawn a better description . . . ." Lewis 34 was gathered on 5 Sep near Verdel, Knox Co., Nebraska (Moulton, 1987a: 469). PH-LC 189 is a mixed collection. The two larger leaves on the lower half of the sheet are probably the leaves gathered by Lewis. Nuttall probably collected the flowering material and two leaves on the upper half of the sheet in the spring of 1811. On the label, Pursh says the fragments were found on the "Mississippi" although in print he lists "Missouri" as one of the numerous locations for the species. There is no indication of any Lewis collection from along the Mississippi River among his lost specimens (Moulton, 1987a: 450-472). (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:09/05/1804