| 1. Corolla 2.53 mm; fruit bumpy or with faint lines |
| M. indicus |
| 1' Corolla 47 mm; fruit irregularly cross-ridged or with network of lines |
| |
| 2. Corolla white, 45 mm; fruit with network of lines |
| M. albus |
| 2' Corolla yellow, 4.57 mm; fruit irregularly cross-ridged |
| M. officinalis
|