Herbs mostly glandular puberulent or glabrous, some­times strigillose or villous on stems; from fibrous rootstock. Leaves in a basal rosette and cauline, basal 3–12 × 0.5–3 cm, petiole 1–3 cm, blade oblanceolate to obovate, margins dentate to remotely denticulate; cauline 2–6(–11) × (0.5–)1–2(–5) cm, sometimes glau­cous; petiole 0.1–2(–6) cm; blade narrowly elliptic to broadly ovate, margins dentate to remotely denticulate. Flowers: buds with free tips (3–)4–8(–13) mm, connivent to spreading; floral tube 5–20 mm; sepals 8–22 mm; petals (8–)15–20(–30) mm. Capsules oblong to oblong-ellipsoid, widest at middle, (5–)10–17(–20) × (2–)3–4(–6) mm, 4-winged, sometimes 4-angled, stipe 0.1–3(–7) mm; sessile. 2n = 28.

Phenology: Flowering Apr–Aug(–Sep).
Habitat: Open meadows, stream margins, edges of woods, open woods.
Elevation: (100–)300–1700 m.

Distribution

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• Legacy Map

N.S., Ont., Que., Ala., Conn., Del., D.C., Ga., Ill., Ind., Ky., La., Maine, Md., Mass., Mich., Mo., N.H., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Va., W.Va.

Discussion

Oenothera serotina Sweet (1826) is a homonym, not Lehmann (1826), while Kneiffia floribunda Spach (1835) is an illegitimate substitution based on O. tetragona, and both names pertain here.

Selected References

None.

Lower Taxa

None.