| 1A. | Inflorescences narrow-cylindrical, floral axis 3.5–6.5 cm long | L. acapulcense |
| 1B. | Inflorescences in spheric or ellipsoid capitula, floral axis 8–20 mm | L. divaricatum |
| 1A. | Inflorescences narrow-cylindrical, floral axis 3.5–6.5 cm long | L. acapulcense |
| 1B. | Inflorescences in spheric or ellipsoid capitula, floral axis 8–20 mm | L. divaricatum |