The radially symmetrical flowers are usually showy and have 4 sepals and 4 petals. The cross-like stigma is 4-branched. The flowers of the evening primroses proper open toward evening, while sundrops bloom during the day. The simple leaves may be opposite or alternate.

Flower This family contains flowers.

Evening-Primrose, Common Oenothera biennis
Gaura, Biennial Gaura biennis
Nightshade, Enchanter's Circaea quadrisulcata
Seedbox Ludwigia alternifolia
Sundrops Oenothera fruticosa
Sundrops, Small Oenothera perennis
Willow-Herb, Common/ Purple-Leaved Willow-Herb Epilobium coloratum
Willow-Herb, Downy Epilobium strictum
Willow-Herb, Hairy Epilobium hirsutum
Willow-herb, Northern Epilobium glandulosum
Willow-Herb, Purple-Leaved