Megapterium missouriense (Sims) Spach [ Oenothera missouriensis Sims]
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Megapterium missouriense (Sims) Spach [ Oenothera missouriensis Sims] [Onagraceae]
M.A. Burnett, G.T. Burnett, Pl. Util., vol. 4 : t. 6 (1850)