Oenothera biennis L.  
Family: Onagraceae
bastard evening-primrose, common evening-primrose
[Oenothera biennis subsp. caeciarum L., Oenothera biennis subsp. centralis L., Oenothera biennis var. biennis L., Oenothera biennis var. pycnocarpa L., Oenothera muricata L., Oenothera pycnocarpa G.F.Atk. & Bartlett]
Oenothera biennis image
Janice Stiefel  
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, biennial/perennial, 2'-6' tall forb, mostly smooth
Leaves: lance-like to oblong, alternate
Flowers: yellow, 4-parted, 3/4"-2" wide; inflorescence a stiff, terminal, usually unbranched spike; blooms July-Oct.
Fruits: capsule thickest near the base, seeds without tufts of hair at the top
Habitat: dry to moderate moisture; disturbed sites, prairies
Conservation Status: Native
Oenothera biennis image
Merel R. Black  
Oenothera biennis image
Merel R. Black  
Oenothera biennis image
Matthew L. Wagner  
Oenothera biennis image
John M. Schoeneker  
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