corolla

(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"

• coil, whorl, roll, curl, curlicue, ringlet, gyre, scroll — a round shape formed by a series of concentric circles

• petal, flower petal — part of the perianth that is usually brightly colored

• perianth, floral envelope — collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamen and carpel