| | 1. Widest leaves or lobes < 3 mm wide, linear to narrowly lanceolate; corolla dark blue-purple; stem glands short-stalked |
| A. gilioides |
| | 2. Flowers 4–8 in ± dense clusters |
| subsp. gilioides |
| | 2' Flowers loosely paired or in 3's, not clustered |
| subsp. violaceum |
| | 1' Widest leaves or lobes 3–15 mm wide, lanceolate; corolla not dark blue-purple; stem glands generally long-stalked |
| |
| | 3. Corolla ± 2-lipped, lobes > 1/2 tube + throat; longest stamens well exserted |
| A. glutinosum |
| | 3' Corolla not 2-lipped; lobes < 1/3 tube + throat; longest stamens exserted or including |
| |
| | 4. Lower leaves 3–13-lobed; corolla 8–22 mm, tube reddish purple, lobes pink |
| A. divaricatum |
| | 4' Lower leaves entire or coarsely toothed; corolla < 11 mm, white |
| A. integrifolium
|