Pursh indirectly refers to the above specimen when he proposed Pyrus sanguinea Pursh (1813: 340) as a new name at the species rank for Mespilus canadensis var. rotundifolia Michx. (Fl. Boreali-Amer. 2: 291. 1803). He reports the distribution of the species as "In Canada and on the banks of the Columbia." Pursh makes no direct mention of the Lewis and Clark sheet. Amelanchier sanguinea (Pursh) DC. (in Prodr. 2: 633. 1825) is a species of eastern North America (Little, 1979). Jones (1946: 62-63) reviews the confusion regarding the definition of A. sanguinea. The type of the species cannot be a Pursh specimen as implied by McVaugh (1935: 30) and seemingly accepted by Ewan (1979: 94). The type of A. alnifolia (Nutt.) Nutt. ex M. Roem. (in Fam. Nat. Syn. Monogr. 3: 147. 1847) is an 1811 Nuttall collection from near present-day Bismarck, North Dakota. Meehan (1898: 24), Cutright (1969: 402) and Moulton (in press) list the sheet as Amelanchier alnifolia. Clark first mentions the taxon on 11 Apr 1806 (Moulton, 1991: 110-111), but the specimen was collected at the "Narrows" of the Columbia River on 15 Apr 1806. Coues (1898: 299) suggests Lewis and Clark gathered the plant at Rock Fort Camp near The Dalles in Wasco Co., Oregon. Moulton (1991: 123-125) notes that the expedition traveled from Major Creek in Klickitat Co., Washington, to Rock Fort Camp, having been delayed that morning as horses were purchased and several stops were made to make observations. (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:04/15/1806