Pursh (1813: 337) associates the Lewis and Clark collection with Crataegus glandulosa Ait. (Hort. Kew. 2: 168. 1789) noting that "M. Lewis, Esq. collected it on the Rocky-mountains." According to the label data the specimen was gathered on 29 Apr 1806 along the Columbia River. On this date the expedition was camped on the north bank of the Walla Walla River in Walla Walla Co., Washington (Moulton, 1991: 186). In his journal, Lewis refers to this as "the purple haw" (Moulton, 1991: 112) and on the label this is given as "Deep purple Haw." Today, the plant is known as black hawthorn. In a footnote Meehan (1898: 24) suggests that the specimen was gathered on 19 Apr, a point questioned by Coues (1898: 299). Inasmuch as Meehan is quoting the label data, the "19" is a lapse for "29" and should be discounted. (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:04/29/1806