| | 1. Flower quickly reflexed, fruit reflexed; leaves basal and generally 1–3 cauline; inflorescence a loose raceme |
| O. deflexa var. sericea |
| | 1' Flower and fruit ascending or erect; leaves all basal; inflorescence densely spike- or head-like |
| |
| | 2. Leaflets 23–39; plant green, puberulent, sticky-glandular; corolla 12–18 mm |
| O. borealis var. viscida |
| | 2' Leaflets 7–17; plant silvery or gray, silky or tomentose, not glandular; corolla 7–10 mm |
| |
| | 3. Flowers 2–12 per inflorescence; fruit ovoid-inflated, ± 7–9 mm wide, papery |
| O. oreophila var. oreophila |
| | 3' Flowers 1–3 per inflorescence; fruit lanceolate, ± 5–6 mm wide, leathery |
| O. parryi
|