| Family | ONAGRACEAE |
| Genus species | Oenothera perennis L. sect. Kneiffia |
| Bibliography | Syst. Nat., ed. 10. 2: 998 (1759) |
| Native Range | Canada to n. & e. USA |
| Primary Biome | Temperate |
| Habitat | grassland and thickets |
| Altitude | 100-900m |
| Description | basal leaves oblanceolate to spathulate, 2-5cm long, stem leaves narrowly lanceolate, flowers 15-20mm across, sepals often reddish |
| Size | 15-40cm |
| Color | yellow |
| Bloom | summer |
| Ca | |
| Type | perennial |
| Cultivation | mesic, slightly humous, semi-shady site alpine house, moist, rich, drained soil, semi-shade |
| Propagation | seed in spring, barely covered, germ. 1-3 months, 18-21°C division in fall; cuttings in late summer |
| Synonyms | Kneiffia gracilis (Schrad. ex Fisch. & C.A.Mey.) Bartl. Kneiffia michauxii Spach Kneiffia perennis (L.) Pennell Kneiffia pumila (L.) Spach Oenothera chrysantha Michx. Oenothera gracilis Schrad. ex Fisch. & C.A.Mey. Oenothera perennis f. rectipilis S.F.Blake Oenothera perennis var. rectipilis (S.F.Blake) S.F.Blake Oenothera perennis var. typica Munz Oenothera pumila L. Oenothera pumila var. chrysantha Gordinier & Howe Oenothera pumila var. minima Lehm. Oenothera pumila var. pusilla (Michx.) Torr. & A.Gray Oenothera pumila var. rectipilis S.F.Blake Oenothera pusilla Michx. Oenothera riparia Lehm. |
| Territory | 7 Northern America 71 Western Canada (BRC British Columbia, MAN Manitoba) 72 Eastern Canada (NBR New Brunswick, NFL Newfoundland, NSC Nova Scotia, ONT Ontario, PEI Prince Edward I., QUE Québec) 73 Northwestern U.S.A. (MNT Montana) 74 North-Central U.S.A. (ILL Illinois, IOW Iowa, MIN Minnesota, MSO Missouri, NEB Nebraska, WIS Wisconsin) 75 Northeastern U.S.A. (CNT Connecticut, INI Indiana, MAI Maine, MAS Masachusettes, MIC Michigan, NWH New Hampshire, NWJ New Jersey, NWY New York, OHI Ohio, PEN Pennsylvania, RHO Rhode I., VER Vermont, WVA West Virginia) 78 Southeastern U.S.A. (DEL Delaware, GEO Georgia, KTY Kentucky, MRY Maryland, MSI Mississippi, NCA North Carolina, SCA South Carolina, TEN Tennessee, VRG Virginia, WDC District of Columbia) |