Smithsonian National Museum of Natural History  
Lewis and Clark as Naturalists
<EM>Polanisia dodecandra </EM>(L.) DC. ssp. <EM>trachysperma </EM>(Torr.&Gray) Iltis - collected by Thos. A. Williams, Cheyenne River, South Dakota, August 1891

collected by Thos. A. Williams, Cheyenne River, South Dakota, August 1891
(from the United States National Herbarium US-519190)
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