Pursh's name is based entirely upon Menzies material collected on the Vancouver expedition to North America from 1791 until 1795. The Lewis and Clark specimen, collected along the Columbia River on 1 Nov 1805, is not mentioned. The expedition was at the Cascades of the Columbia and much of the day was spent moving canoes and baggage over a "bad Slippery and rockey way" in what is now Skamania Co., Washington. There is no mention of this common shrub having been collected on this day (Moulton, 1988: 366-373). (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:11/01/1805