*Oenothera speciosa Nutt.

Hairs on the stem short. Fruit ± 4-angled; upper fertile part 2–5 mm diam. Leaves narrow-ovate to elliptic, c. 3 cm long, sinuate, obscurely dentate. Erect herb with underground runners. Cumberland Plain. Waste land and grasslands. Introd. from America. Fl. spring–summer