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In botany, a 'rosette' is a circular arrangement of the leaves, with all the leaves at a single height. Often, perennial plants whose foliage dies and the remaining vegetation protects the plant. Internodes are often shortened getting the leaves closer together, as in lettuce and dandelion. This is an example of a modified stem.
Many plant families have rosettes; they are particularly common in Asteraceae (e.g., dandelions), Brassicaceae (e.g., cabbage), and Bromeliaceae.