2. A perennial land, or terrestrial, plant that propagates from organs; such as, bulbs, tubers, or rhizomes that are below ground.
3. A perennial plant; such as, a crocus or tulip, propagated by buds on underground bulbs, tubers, or corms.
Corms are short swollen underground stem bases in some plants; such as, crocuses and gladioli that store food over the winter and produce new foliage in the spring. New corms often form on top of old ones and are used as a means of producing new plants.