On 7/29/2016 at 0:23 PM, Bhukhhad said:B. Turiya/Torai/Ridge Gourd
This is Not the luffa. The vegetable you have shown in the picture is a Ridge gourd. A luffa is smooth skinned and we call it a Galku/Gilki. So again Turiy in Gujarat and Torai in Punjab. Some of the dishes associated with the ridge gourd are:
Turiya mag ni daal shaak, Turiya patra shaak, Torai tamatar, Torai lobiya, and Ridge Gourd peel chutney
I gather the two types are called by different names in English by you and folks in your area where you live in South Asia. Still, they are both luffas/loofahs. The one you call "ridge gourd" is Luffa acutangula while the one you describe as "smooth" and as "luffa" (actually, slightly bumpy skin but no ridges) is Luffa aegyptiaca. The "combined" wiki article is here.