Smithsonian National Museum of Natural History  
Lewis and Clark as Naturalists
<EM>Machaeranthera pinnatifida </EM>(Hook.) Shinners - collected by Thos. A. Williams 166, Cheyenne River, South Dakota, August 1891

collected by Thos. A. Williams 166, Cheyenne River, South Dakota, August 1891
(from the United States National Herbarium US-519100)
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