corolla(n = noun.plant) - (botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth; "we cultivate the flower for its corolla"
is a kind of coil, curl, curlicue, gyre, ringlet, roll, scroll, whorl
is a part of chlamys, floral envelope, perianth, perigone, perigonium
has parts: flower petal, petal, corona

   The inner envelope of a flower; the part which surrounds the organs of fructification, consisting of one or more leaves, called petals. It is usually distinguished from the calyx by the fineness of its texture and the gayness of its colors. See the Note under Blossom. [1913 Webster]

corolla, n. Bot. a whorl or whorls of petals forming the inner envelope of a flower.

Etymology:
L, dimin. of corona crown