Megapterium missouriense (Sims) Spach [ Oenothera missouriensis Sims]
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Megapterium missouriense (Sims) Spach [ Oenothera missouriensis Sims] [Onagraceae]
E. Step, D. Bois, Favourite Fl., vol. 2 : t. 104, fig. B (1896) [D.G.J.M. Bois]