Trifolium macrocephalum (Pursh) Poir. in Lamarck, Encycl. Suppl. 5(1): 336. 1817, based on Lupinaster macrocephalus Pursh, Fl. Amer. Sept.: 479, ad t. 23. Dec (sero) 1813. - Lectotype: PH-LC 213 (Moulton 167b), designated here! Duplicate of the lectotype: PH-LC 212 (Moulton 167a). Pursh provides an extended description giving the location as "At the head-waters of the Missouri . . . April, May." The lectotype is the basis for the Pursh figure (Rossi & Schuyler, 1993: 49). The type was collected at Rock Fort Camp near The Dalles in Wasco Co., Oregon, on 17 Apr 1806. We can not account for the "May" reference. (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