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(botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth
(botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green
a whorl of leaves growing around a stem
persistent enlarged calyx at base of e.g. a strawberry or raspberry
calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions