* Bulb: Think of onions, garlic, tulips, and lilies. These plants store food and nutrients in a round, underground stem called a bulb.
* Corm: Similar to bulbs, but the stem is solid and not layered. Examples include crocus, gladiolus, and freesia.
* Tuber: Potatoes are the most familiar example. Tubers are swollen underground stems that store food.
* Rhizome: Ginger and bamboo are examples. Rhizomes are horizontal underground stems that can send up new shoots.
* Tuberous root: Sweet potatoes and dahlias store food in thickened roots that function like underground stems.
Let me know if you'd like more information about any of these types of underground stems!
