| Family | ONAGRACEAE |
| Genus species | Oenothera macrocarpa Nutt. sect. Megapterium |
| Bibliography | Cat. Pl. Upper Louisiana: no. 56 (1813) |
| Native Range | c. & ec. USA to ne. Mexico |
| Primary Biome | Temperate |
| Habitat | steppes |
| Altitude | 100-500m |
| Description | subglabrous, stems ramose, leaves lanceolate, petiolate, sparsely glandular-denticulate, flowers solitary, to 8cm across, petals obcordate, capsules ellipsoid, 4-winged |
| Size | 5-10cm |
| Color | pale yellow |
| Bloom | summer |
| Ca | |
| Type | perennial |
| Cultivation | sunny site with a deep, drained soil alpine house, rich, drained soil, sun |
| Propagation | seed in spring, barely covered, germ. 1-3 months, 18-21°C division in fall; cuttings in late summer |
| Synonyms | Megapterium macrocarpum (Nutt.) R.R.Gates Megapterium missouriense (Sims) Spach Megapterium nuttallianum Spach Oenothera alata Nutt. Oenothera macrocarpa var. missouriensis (Sims) Carriére Oenothera missouriensis Sims Oenothera missouriensis f. elongata F.C.Gates Oenothera missouriensis f. intermedia H.Lév. Oenothera missouriensis var. latifolia A.Gray Oenothera missouriensis var. typica Munz |
| Territory | 7 Northern America 74 North-Central U.S.A. (ILL Illinois, KAN Kansas, MSO Missouri, NEB Nebraska, OKL Oklahoma) 77 South-Central U.S.A. (TEX Texas) 78 Southeastern U.S.A. (ARK Arkansas, TEN Tennessee) 79 Mexico (MXE Mexico Northeast) |
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