| | 1. Spur generally < 1/2 corolla tube length (sometimes ± 0), slender, tip generally enlarged; fruit winged or not, wing margins not thickened; convex side of fruit body generally keeled, not grooved lengthwise |
| |
| | 2. Corolla 1.5–3.5 mm, white to very pale pink |
| P. brachystemon |
| | 2' Corolla 4–9.5 mm, pale to dark pink |
| P. congesta |
| | 1' Spur generally 1/2+ corolla tube length, slender or blunt, tip not enlarged; fruit winged, wing margins thickened; convex side of fruit body grooved lengthwise, not keeled |
| |
| | 3. Corolla white to pale pink, ± radial, lobes ± equal, not red-spotted, spur thick, blunt; fruit glabrous to hairy near tip or along margins |
| P. macrocera |
| | 3' Corolla pink to dark pink, 2-lipped, lower lip with 2 red spots, spur slender, pointed; fruit hairs in vertical bands |
| P. ciliosa |
| | 4. Corolla 3.5–8.5 mm, spur > ovary |
| subsp. ciliosa |
| | 4' Corolla 1.5–3.5 mm, spur generally < ovary |
| subsp. insignis
|