| 1. Calyx lobes ovate, tip obtuse to acute, ± = fruit; leaves petioled if serrate |
| L. uniflorus |
| 1' Calyx lobes awl-like, tip acuminate to short-awned, generally > fruit; leaves ± sessile if serrate |
| |
| 2. Leaves generally short-petioled, deeply lobed to cut in lower half; fruit 11.5 mm, top rounded |
| L. americanus |
| 2' Leaves generally subsessile to sessile, serrate; fruit 1.52 mm, top ± truncate |
| L. asper
|