Oenothera grandis
showy evening-primrose, largeflower eveningprimrose, showy eveningprimrose, showy evening primrose
Family
Onagraceae
Leaf Arrangement
alternate
Leaf Attachment
petiolate
Leaf Margin
entire, lobed, pinnatifid, sinuate
Leaf Type
simple
Leaf Shape
elliptic, oblanceolate
Growth Form
forb
Flower Color
yellow
Flower Month
March - July
Height (meters)
0.5 - 0.8
Milky Sap
No
Armed/Unarmed
Unarmed
Origin
native
Lifespan
annual, biennial
Growing Season
Cool season
Prairie Coefficient of Conservatism
7
Field Characters
Similar to Oenothera laciniata, but has longer flower petals.
Cultural Information
Seed germination for all members of the genus oenothera are reported to be improved by cold/moist stratification (Steffen 1997).
Natural History
Scattered in south Louisiana and east, central, and southern Texas. It is possible that evening primroses are edible as none have been reported poisonous (Harrington 1967).
Habitat
Sandy open places.