| | 1. Herbage and inflorescence minutely scabrous or puberulent; fruit ribs thread-like to acute, barely winged |
| L. apiifolium |
| | 1' Herbage, inflorescence ± glabrous; fruit ribs distinctly but narrowly thin-winged |
| |
| | 2. Cauline leaves 1–3, generally 2–3, ± = basal; rays generally 16–30; leaf segments generally wide and obtuse |
| L. californicum |
| | 2' Cauline leaves 0–2, generally 1, << basal; rays generally 5–16; leaf segments generally narrow and acute |
| L. grayi
|