Oenothera pilosella subsp. pilosella Jennings (redirected from: Kneiffia sumstinei)
Family: Onagraceae
[Kneiffia pratensis Small,  more...]
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From Flora of Indiana (1940) by Charles C. Deam

Usually common where found. In low ground in open woods, open marshy places, and fallow fields of slightly acid soil and along roadsides.