| | 1. Inflorescence < to barely > leaves; style ± curved; leaf blade linear to narrowly lanceolate, base tapered; pedicels generally spreading to recurved |
| A. gramineum |
| | 1' Inflorescence generally >> leaves; style ± straight, erect; leaf blade generally lanceolate to ovate, base tapered, truncate, or slightly lobed; pedicels generally ascending to erect |
| |
| | 2. Petals pink; leaf blade generally lanceolate, base tapered; lateral walls of fruit thin, translucent |
| A. lanceolatum |
| | 2' Petals generally white, sometimes pink; leaf blade lanceolate to ovate, base truncate to slightly lobed; lateral walls of fruit thick, opaque |
| A. plantago-aquatica
|