Oenothera speciosa Nutt.

• Authority

  Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

• Family

  Onagraceae

• Scientific Name

  Oenothera speciosa Nutt.

• Description

  Species Description - Perennial by creeping roots (sometimes annual?), ascending to erect, 1–6 dm; lvs linear to lanceolate or oblanceolate, 3–8 cm, gradually tapering to a petiolar base, entire to runcinate-pinnatifid, the basal half commonly more coarsely toothed than the upper; fls few, sessile in the upper axils, erect, buds nodding, long-acuminate; hypanthium slender, 1–2 cm, strigose; sep lance-linear, reflexed at anthesis, 1.5–2.5 cm, usually long connivent; pet obcordate, white or pink, 2–4 cm; stamens alternately unequal; fr narrowly obovoid or clavate, 10–18 mm, 4-sided, roundly 8-ribbed and deeply sulcate, tapering to both ends, sterile below; 2n=14. Dry, open places; Mo. and Kans. to Tex., and intr. eastward. May, June. (Hartmannia s.)

• Common Names

  white evening-primrose