It is fleshy cylindrical modification of stem and carry photosynthesis.
Cactus
Neem
Grapes
Euphorbia
Potatoes develop on
Thorns, spines and prickles are
A horizontal underground stem is a
In Garlic $(Allium\,\, sativum)$ each fleshy scale represents a bud called bulblet or clove. It is a bud because
Potato is $(underground)$ stem because it