The petals of a flower considered as a group or unit and usually of a color other than green; the inner whorl of the perianth.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "corolla" in a sentence
"I am very curious where in corolla this was, in front of which sub-division."
"Flowers – light blue, small, on a one-sided raceme, coiled up at the tip and unfolding as the flowers open – calyx five-lobed – corolla is round and flat, or salver shaped – stamens five – there is a white species of the flower."
"The straws resemble a flower from the region, called centropogon nigricans, which has a funnel-like neck called a corolla, at the base of which is its nectar."