| 1. Leaves ± toothed; petal bases bright purple; fruit segment 2.83.5 mm |
| E. rotundifolia |
| 1' Leaves palmately lobed to parted; petals uniformly colored; fruit segment 1.42 mm |
| |
| 2. Petals 45.5 mm, ± = calyx; stem prostrate to decumbent |
| E. exilis |
| 2' Petals 5.525 mm, often >> calyx; stem generally ± erect |
| E. parryi |
| 3. Some plants with only pistillate flowers; calyx 4.510 mm, lobes 1.53.5 mm wide |
| subsp. kernensis |
| 3' All plants with only bisexual flowers; calyx 1014 mm, lobes 2.55 mm wide |
| subsp. parryi
|