| Corallorhiza maculata var. maculata | spotted coralroot | A2 |
| Corallorhiza striata | striped coralroot | A1x |
| Epipactis gigantea | stream orchid | A1 |
| Piperia elegans subsp. elegans | coast piperia, elegant piperia | C |
| Piperia elongata | chaparral orchid, wood rein-orchid, elongate piperia | C |
| Piperia michaelii | Michael's rein-orchid | *A2 |
| Piperia transversa | flat spurred piperia, transverse piperia | B |
| Piperia unalascensis | Alaska piperia, slender-spire orchid | A1 |
| Platanthera dilatata var. leucostachys | white-flowered bog-orchid | A1x |
| Spiranthes porrifolia | western ladies' tresses | A1x |
| Spiranthes romanzoffiana | hooded ladies' tresses | A1 |