1. Vigorous stem: The stem which can stand upright independently above the ground is called Vigorous stem. Like- mango, jam, litchi etc.
2. Weak Stems: Those stems which cannot stand upright independently above the ground are called weak stems. For example- Gourd, Pumpkin, Durbaghas etc.
3. Rhizome: The stems that grow parallel to the ground are called rhizomes. Like ginger, turmeric etc.
4. Tuber: When the tip of the underground branch of the stem is swollen and rounded to store food, it is called a tuber. For example, round potatoes.
5. Bulbs: All metamorphosed stems that are short and disc-like in shape are called bulbs. For example, onion, garlic etc.
6. Runner: A runner is a weak stem and bends like a bow. It has non-local roots. Thankuni, Kachuripana, Kachu, Strawberry etc.
7. Hollow stem: Some stems are hollow in the center. Plants of the family Poaceae, Cyperaceae, Lamiaceae etc. have hollow stems. The stems of Cyperaceae are three-cornered and those of Lamiaceae are four-cornered.