(noun.) (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'.
吉米编辑
双语例句
I have come to this conclusion from finding it an invariable rule that when a flower is fertilised by the wind it never has a gaily-coloured corolla. 查尔斯·达尔文.物种起源.