| |
| | 2. Spur ± straight, perpendicular to inflorescence axis; upper sepal pointed forward; stem generally < 3 mm diam |
| P. transversa |
| | 2' Spur ± curved, parallel to inflorescence axis; upper sepal erect, lip curved down or pointed forward; stem generally > 3 mm diam |
| |
| | 3. Sepals white with dark green midvein, petals white to pale green |
| P. elegans |
| | 3' Perianth green to yellow-green throughout |
| |
| | 4. Lip triangular; lateral petals ± sickle-shaped, flat; lower sepals ± reflexed |
| P. elongata |
| | 4' Lip ± ovate-deltate; lateral petals ± straight, ± concave; lower sepals spreading |
| P. michaelii |
| |
| | 5. Upper sepal and lateral petals mostly white or with white margins; lower sepals and lip mostly white; lip recurved toward spur |
| |
| | 6. Inflorescence generally 1-sided; lateral petals straight, white, midvein green; lip ± obtuse; Northwestern California, sw San Francisco Bay Area |
| P. candida |
| | 6' Inflorescence ± cylindric; lateral petals ± curved, green with wide white margin; lip ± acute; c Central Coast |
| P. yadonii |
| | 5' Perianth green throughout; lip ± straight to upcurved above middle |
| |
| | 7. Lip narrowly lanceolate; lateral petals ± recurved; spur curved, pointed down |
| P. leptopetala |
| | 7' Lip oblong to ± deltate; lateral petals spreading to ± pointed forward; spur straight or curved, pointed back or down |
| |
| | 8. Lip flat; seeds dark brown; Southwestern California |
| P. cooperi |
| | 8' Lip (especially tip) upcurved; seeds tan to reddish brown; California Floristic Province (except Southwestern California), Modoc Plateau |
| P. unalascensis
|