Oenothera pilosella
Family: Onagraceae
meadow evening-primrose, meadow sundrops, prairie sundrops
Oenothera pilosella image
Kitty Kohout  
Etymology: Oenothera: from Greek oinos, "wine," and thera, "to imbibe," because an allied European plant was thought to induce a taste for wine
Plants: erect, perennial, to 32" tall forb, with long hairs especially towards the top
Leaves: lance-like, mostly stalkless, alternate
Flowers: 4-parted, 1 1/4"-2" wide, unopened flowers not nodding, petals notched at the tip; inflorescence a dense spike; blooms June-July
Fruits: elliptical capsule tapering towards the base
Habitat: moist to wet; meadows, fields, open woods
Conservation Status: Introduced - escaped