| 1 | Sprawling annual 5-25(-40) cm high; calyx-teeth recurved, aristate, the adaxial much larger than the abaxial; corolla white or tinged mauve |
| 1' | Erect perennial 40-100 cm high from a woody base; calyx-teeth erect, subequal; corolla yellow and brown |
| 2 | Cauline leaves densely white-tomentose; calyx-teeth oblong, subacute; corolla yellow, streaked and margined brown; corolla tube c. 11 mm long; nutlets c. 2.8 mm long |
| 2' | Cauline leaves thinly hispidulous; calyx-teeth deltoid-acute; corolla uniformly pale yellow; corolla tube c. 8 mm long; nutlets c. 2 mm long |
