The sheet is a mixture of Atriplex canescens (right hand specimen) and A. gardneri (left and middle specimens)...These specimens [atriplex gardineri], unlike the mixed collection just mentioned under Atriplex canescens, were collected on 20 Jul 1806 in Montana. On that date Lewis found Sarcobatus vermiculatus on the river bottom along the Marias River in Toole Co. (Moulton, 1993: 118-120). We suspect he got A. gardneri at the same time although here the location information is given simply as "the high plains of Missouri." It is less likely that Clark would have collected the plant. In adopting A. gardneri over A. nuttallii, we are following Stutz and Sanderson (1998). The right hand specimen on PH-LC 34 is A. canescens (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:07/20/1806

These specimens, unlike the mixed collection just mentioned under Atriplex canescens, were collected on 20 Jul 1806 in Montana. Pursh: "A half Shrub from the high plains of Missouri Jul. 20th 1806." On that date Lewis found Sarcobatus vermiculatus on the river bottom along the Marias River in Toole Co. (Moulton, 1993: 118-120). We suspect he got A. gardneri at the same time although here the location information is given simply as "the high plains of Missouri." It is less likely that Clark would have collected the plant. In adopting A. gardneri over A. nuttallii, we are following Stutz and Sanderson (1998). The following is material added to this electronic publication (E. E. Spamer and R. M. McCourt, PH). Moulton (1999, pl. 27) identified this material as Atriplex gardneri (Moq.) D. Dietr. (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:07/20/1806