sepal

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Related to Merosity: trimerous

sepal

a modified leaf (usually green) forming part of the CALYX of the flower of a DICOTYLEDON, which often protects the flower while in bud but which can be modified for other functions; for example in the dandelion it forms the seed parachute.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005