| 1. Leaves awl-like, cylindric; style > ovary, slender |
| L. subulata |
| 1' Leaves flat, blade linear to ovate; style < or = ovary, stout |
| |
| 2. Leaf linear to ± spoon-shaped, petiole not differentiated; corolla lobes rounded |
| L. acaulis |
| 2' Leaf blade spoonshaped to ovate, petiole clearly differentiated; corolla lobes acute |
| L. aquatica
|