Smithsonian National Museum of Natural History  
Lewis and Clark as Naturalists
<EM>Urtica dioica </EM>L. ssp. <EM>gracilis </EM>(Ait.)Seland. - Urtica dioica ssp. gracilis (M. Rivers Smith)

Urtica dioica ssp. gracilis (M. Rivers Smith)
(Photo © Marcia Rivers Smith)
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