| Family | ONAGRACEAE |
| Genus species | Oenothera trichocalyx Nutt. sect. Anogra |
| Bibliography | Fl. N. Amer. [J.Torrey & A.Gray] 1: 494 (1840) |
| Native Range | wc. USA |
| Primary Biome | Temperate |
| Habitat | sandy grassland |
| Altitude | 1100-2500m |
| Description | strigulose, stems usually simple, leaves in rosette, narrowly oblanceolate to oblong, pinnatifid or dentate, flowers solitary, petals 1-2cm |
| Size | 10-35cm |
| Color | white |
| Bloom | late spring, summer |
| Ca | |
| Type | biennial |
| Cultivation | sunny site with a poor, sandy soil alpine house, sandy soil, sun |
| Propagation | seed in spring, barely covered, germ. 1-3 months, 18-21°C |
| Synonyms | Anogra rhizomata A.Nelson Anogra trichocalyx (Nutt.) Small Anogra violacea A.Nelson Anogra vreelandii Rydb. Oenothera albicaulis var. trichocalyx (Nutt.) Engelm. Oenothera pallida var. trichocalyx (Nutt.) Dorn Oenothera pallida ssp. trichocalyx (Nutt.) Munz & W.E.Klein Oentohera trichocalyx f. acaulis H.Lév. Oenothera trichocalyx f. albicauloidea H.Lév. Oenothera trichocalyx f. heterophylla H.Lév. Oenothera trichocalyx f. mollis H.Lév. Oenothera trichocalyx var. piperi Jeps. Oenothera trichocalyx f. refracta H.Lév. |
| Territory | 7 Northern America 73 Northwestern U.S.A. (COL Colorado, WYO Wyoming) 76 Southwestern U.S.A. (ARI Arizona, UTA Utah) 77 South-Central U.S.A. (NWM New Mexico) |