| Family | FABACEAE |
| Genus species | Trifolium rydbergii Greene trib. Trifolieae |
| Bibliography | Pittonia 3: 222 (1897) |
| Native Range | wc. USA |
| Primary Biome | Subalpine |
| Habitat | grassland and rocks |
| Description | stems stout, leaflets of lower leaves oval, leaflets of the others elliptic to narrowly lanceolate, serrulate, floral heads ovoid, 3-5cm, calyx lanate |
| Size | 20-30cm |
| Color | purple |
| Bloom | summer |
| Ca | |
| Type | perennial |
| Cultivation | rock crevices with favourable water regime, eastern slopes alpine house, poor, drained soil, shading in summer |
| Propagation | seed in spring, germ. 1-3 months, 13-18°C basal cuttings in late spring and late summer |
| Synonyms | Trifolium longipes var. reflexum A.Nelson Trifolium longipes ssp. reflexum (A.Nelson) J.M.Gillett Trifolium oreganum var. rydbergii (Greene) McDermott Trifolium rusbyi ssp. reflexum (A.Nelson) D.Heller & Zohary |
| Territory | 7 Northern America 73 Northwestern U.S.A. (COL Colorado, IDA Idaho, MNT Montana, ORE Oregon, WYO Wyoming) 76 Southwestern U.S.A. (ARI Arizona, NEV Nevada, UTA Utah) 77 South-Central U.S.A. (NWM New Mexico) |