1. It is a modified underground stem.’
2. It is small cone or disc-like structure.
3. It is a condensed shoot.
4. It contains concentric whorls of fleshy scales covered by few dried scales. Lateral buds are present in the axil of fleshy leaves and terminal buds at the apex.
1. It is a modified aerial stem
2. It is a multicellular and globular structure.
3. A vegetative or floral bud in the axil of a leaf is modified into bulbil.
4. It contains few buds which give rise to aerial shoot.