Evening Primrose: Night Willow-herb.

Oenothera biennis. Evening Primrose Family. June - Sept.

A plant 1 - 5 feet high, found in fields and roadsides. Labrador to Gulf, west to Rockies.

Flowers

Yellow, 4-parted, 1 - 2 inches across, in terminal spikes, opening in the evening.

Leaves

Alternate, lance-shaped, mostly seated on stem, obscurely toothed. Plant stem leafy, hairy, more or less branched.

Common Evening Primrose.