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Many plants sold as "Bulbs," botanically are not. For those of you who like to know these things, here are the definitions and a few examples of each type:
Bulb: A modified,much shortened shoot, enclosed by scale leaves and used to store food.
Examples: Lillies and Crinums.
Corm: Swollen stem base, used to store food.
Examples: Gladioli and Freesias.
Tuber: Modified swollen roots, used to store food.
Examples: Dahlias and Begonia.
Rhizome: A modified stem with scale leaves growing at or below ground level.
Examples: Clivia and Canna.