Psilostrophe tagetina (Nutt.) Greene [ Riddellia tagetina Nutt.]
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Psilostrophe tagetina (Nutt.) Greene [ Riddellia tagetina Nutt.] [Compositae]
W.H. Emory, Not. Milit. Reconn.: p. 156, t. 5 (1890) [n.a.]