corolla

noun

1. (botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth

   noun.plant

   Examples

   We cultivate the flower for its corolla.

   Source: WordNet 3.0

2. The inner envelope of a flower; the part which surrounds the organs of fructification, consisting of one or more leaves, called <i>petals</i>. It is usually distinguished from the calyx by the fineness of its texture and the gayness of its colors. See the Note under <u>Blossom</u>.

   noun

   Source: webster1913