Smithsonian National Museum of Natural History  
Lewis and Clark as Naturalists
<EM>Trifolium macrocephalum </EM>(Pursh) Poir. - collected by J.W. Thompson 4217, Wasco Co., Oregon, 13 May 1928

collected by J.W. Thompson 4217, Wasco Co., Oregon, 13 May 1928
(from the United States National Herbarium US-1438133)
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