co·rol·la 
(kə-rōlə, -rŏlə)
(kə-rōlə, -rŏlə)n.
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.
[Latin corōlla, small garland, diminutive of corōna, garland; see CORONA.]
co·rollate′ (-rōlāt′, -rŏlāt′) adj.