Oenothera villosa subsp. villosa
Family: Onagraceae
Hairy Evening Primrose
[Oenothera albinervis R.R. Gates,  more...]
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From Flora of Indiana (1940) by Charles C. Deam

This is the form that has been regarded as Oenothera strigosa (Rydb.) Mack. & Bush. It is more common than the preceding species and has the same habitats.