Whiteflower Rein Orchid, White-flower Rein Orchid, White-lip Rein Orchid: Piperia candida? - Collected in Klickitat County, but I'm not sure where....I've possibly seen it at the DNR quarry at the Yakama nation boundary on Mt. Adams?. Spur equal to or shorter than the lip. Sepals are white with central green stripe. Racemes often one-sided (secund) or nearly so and laxly flowered.
Elegant Piperia, Elegant Rein Orchid, Elegant Rein-orchid, Hillside Rein Orchid, Hillside Rein-orchid, Long-spurred Rein Orchid: Platanthera elegans ssp. elegans (Synonyms: Habenaria elegans, Habenaria greenei, Piperia elegans ssp. elegans, Piperia maritima, Piperia multiflora) - Spur much longer than lower lip of flower. Sepals white with green central stripe. Spur curves downward along stem.
Denseflower Rein Orchid, Dense-flower Rein Orchid, Dense Orchid, Green-flowered Piperia: Platanthera elongata (Synonyms: Habenaria unalascensis ssp. elata, Habenaria unalascensis var. elata, Piperia elegans var. elata, Piperia elongata, Piperia lancifolia, Piperia longispica, Platanthera unalascensis ssp. elata) - Spur much longer than lower lip of flower. Sepals green, yellow-green or translucent. Spur curves downward along stem.
Royal Rein-orchid, Royal Rein Orchid, Suksdorf's Piperia, Suksdorf's Rein Orchid: Platanthera transversa (Synonyms: Habenaria elegans, Habenaria unalascensis var. elata, Piperia transversa) - Spur much longer than the lower lip of the flower. Sepals white with green central stripe. Spur held horizontal to the scape.
Alaska Rein Orchid, Alaskan Rein Orchid, Short-spurred Bog Orchid, Short-spurred Piperia, Slender-spire Orchid: Platanthera unalascensis (Synonyms: Habenaria unalascencis, Habenaria schischmareffiana, Piperia unalascensis, Platanthera cooperi, Spiranthes unalascensis) - Spur equal to or shorter than the lip. Sepals green, yellow-green or translucent.