Image by Aarti S. Khale 

Cactus For ID : Nasik : 200714 : AK-34 : 6 posts by 3 authors. Attachments (1).
Cultivated, cactus seen at a cactus house on 27/2/14.

Small plant without any leaves.

Cereus spegazzinii -forma cristata.

This is a crested plant …,

Crested Monvillea spegazzinii. In my experience with these, they will revert back and forth between normal and crested, some will even stay crested for years, bloom and grow and then revert to crested again.