Sundrops
Oenothera fruticosa
From Nearctica
Identification: Flowers yellow, large (1 to 2 inches in diameter), with 4 petals and 8 stamens. Petals typically with green, radiating lines. Stigma with 4 lobes, cross-shaped, with an elongate style. Calyx with 4 sepals, the sepals bent downward (reflexed). Seed capsules ovate, elongate, with 4 strong wings. Leaves elongate, narrow, and with smooth outer margins. Plant 1 to 3 feet in height.
Distribution: Throughout eastern North America.
Habitat: Sundrops occur in a variety of habitats including stream sides, open fields, and open woods.
Flowering period: June to August.
Similar Species: The large yellow flowers, reflexed sepals, long calyx tube, day flowering habit, and the green lines on the petals will usually identify this species.
Comments: Sundrops, unlike most species of Oenothera, are day flowering.