calyx

Definitions of calyx
1

n (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

Types:
hull
persistent enlarged calyx at base of e.g. a strawberry or raspberry
pappus
calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions
thistledown
pappus of a thistle consisting of silky featherlike hairs attached to the seed-like fruit of a thistle
Type of:
coil, curl, curlicue, gyre, ringlet, roll, scroll, whorl
a round shape formed by a series of concentric circles (as formed by leaves or flower petals)

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