Megapterium missouriense (Sims) Spach [ Oenothera missouriensis Sims]
      
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6 1188293 Megapterium missouriense (Sims) Spach [125 710278 Oenothera missouriensis Sims] Onagraceae
R. Morris, Fl. Conspic.: t. 31 (1826) [W. Clark]