| | 1. Leaf pinnately lobed; inflorescence axis wings 3–5, very narrow, rough-hairy |
| L. sinuatum |
| | 1' Leaf ± entire or wavy-margined; inflorescence axis wings 0 or 2, wide, glabrous |
| |
| | 2. Inflorescence with some non-flower branches |
| L. otolepis |
| | 2' Inflorescence without non-flower branches |
| |
| | 3. Inflorescence > 1 m, axes winged |
| L. arborescens |
| | 3' Inflorescence < 1 m, axes not winged |
| |
| | 4. Leaf blade obovate to oblong, base tapered; calyx lobes white |
| L. californicum |
| | 4' Leaf blade round to wide-ovate, base ± truncate; calyx lobes blue-purple |
| L. perezii
|