| 1 | Peduncles glabrous; seeds acutely tuberculate; leaves usually hastate; corolla milky-white tinged mauve |
| 1' | Peduncles hairy; seeds cerebriform-alveolate |
| 2 | Calyx-lobes broadly lanceolate, distinctly accrescent in fruit and plicate to the base; corolla yellow with blackish-maroon adaxial lobes |
| 2' | Calyx-lobes lanceolate or deltoid, not noticeably accrescent or plicate at the base |
| 3 | Peduncles 0.8-2(-3) cm long, much longer than the subtending leaves; corolla yellow with violet adaxial lobes; at least some leaves hastate; capsule 4-5 mm diam. |
| 3' | Peduncles very short (less than 1 cm long) or flowers commonly subsessile; corolla usually white with blue or purplish adaxial lobes; leaves with rounded base, not hastate; capsule c. 2-5-3 mm diam. |
