The type specimens were collected near Kamiah in Idaho Co., Idaho, on 29 May 1806 (Cutright, 1969: 420). The species does not seem to be discussed although it is possible that references to "seven bark" by Lewis on 5 Jun might apply to Holodiscus rather than Physocarpus as suggested by Moulton (1991: 335, 337). The rationale for this is that the label states "A Shrub growing much in the manner of Nine bark." This statement implies Lewis knew the common name, nine bark, and that it was different from the plant he found "On the waters of [the] Kooskooskee." (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:05/29/1806