Key to the similar species of B. godefroyi:

1. Fruiting calyx deeply ribbed; capsules completely enclosed by the calyx....................................................................... T. godefroyi

- Fruiting calyx shallowly ribbed; capsules exposed at apices ............................................................................................................2.

2. Flowers larger; corolla> 6 mm, purple to violet; glandular hairs are present on lower lips............................................. T. crustacea

- Flowers smaller; corolla <6 mm, white to palest purple; glandular hairs are absent on lower lips ..................................................... .................................................................................................................................... T. siliguriensis Pal & Chowdhury (2021: 237)