| 1 | Calyx tubular or campanulate, 5-veined |
| 1' | Calyx clearly bilabiate, 10-veined |
| 2 | Corolla-tube short, less than 10 mm long, shorter than corolla-limb; bracts often blotched white or pink; adaxial lip of corolla entire or subentire, not bifid; plant annual |
| 2' | Corolla-tube long, slender, more than 10 mm long, exceeding the corolla-limb; bracts not blotched |
| 3 | Bracts petiolate; adaxial lip of corolla bifid; flowers striped with darker venation; plant perennial |
| 3' | Bracts sessile, amplexicaul; flowers not striped; adaxial lip of corolla entire or obscurely emarginate; plant annual |
