| Plant | repent at base | procumbent or repent at base |
| Stem | glabrous, glabrescent or pilose; subterranean stem internodes 5-10 cm long | villose; subterranean stem internodes 1-2 cm long |
| Leaf | petiole 1.5-4.0 cm long, glabrous or pilose; blade 7-17 cm long; stipules 3-5 mm long | petiole 1-6 cm long, villose; blade 7-23 cm long; stipules 5-15 mm long |
| Flower | 2- to 10-flowered; peduncle 2.5-4 cm long when flowering, 8-10 cm long when fruiting; corolla tube and lobes purple; style c. 12 mm long and stigmas included in long-styled flowers | 5- to many-flowered; peduncle 3-8 cm long when flowering, 12-15 cm long when fruiting; corolla tube purple and lobes white; style 15-17 mm long and stigmas exserted in long-styled flowers |
| Capsule | 3-4 mm x 8-10 mm, glabrous or glabrescent | 5-6 mm x 10-12 mm, densely villose |