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Family: onagraceae
Common name(s): common evening primrose
Hardiness ratings: USDA zone 4~5 - 8~9 
General resources
Links for Oenothera biennis
- BBC Gardening - Plant profile with horticultural details and garden uses.
 (1 photo)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 5-8) (14 photos)
- Garden.org - Community-assembled plant profile (23 photos)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations.
- Kansas Wildflowers & Grasses - Plant portrait with botanical details and description (8 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (41 photos)
- Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 4-9)
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (9 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (9 photos)
- Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. (1 photo)
- Turner Photographics - Profile of wildflower of the US Pacific Northwest, with botanical description, habitat and distribution, and photo gallery.
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