| 1 | Flowers usually 5 or 7 in leaf axil; leaf blades 5-25 cm long |
| 1' | Flowers solitary or in groups of 3 in leaf axil; leaf blades 2.5-7 cm long |
| 2 | Corolla reddish, 17-20 mm long. Introduced |
| 2' | Corolla light violet or mauve, 8.5-9 mm long |
| 3 | Corolla glabrous without, lobes of upper lip 1.2 mm long; staminode present; filaments basally free |
| 3' | Corolla pubescent without, lobes of upper lip 0.6 mm long; staminode absent; filaments united at base |
