The Lewis and Clark specimen was gathered along the Columbia River at Rock Fort Camp near The Dalles in Wasco Co., Oregon, on 17 Apr 1806 (Moulton, 1991: 130-135). The specimen was recently misidentified as Amsinkia intermedia Fisch. & C. A. Mey. (Index Sem. Hort. Petrop. 2: 26. 1836), an unrelated species that occurs in the area. The cruciform fruits of the specimen are diagnostic. (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:04/17/1806