involucrum

/in-vuh-loo-kruhm/US // ˌɪn vəˈlu krəm //

总苞,总苞叶,总状花序,总苞叶子

Definitions

n.名词 noun

They have also always an involucrum below the298 calyx, but this involucrum differs in the different genera.
In the genus Malva, the involucrum consists of three leaflets, which in the common Mallow (Malva sylvestris) are oblong.
As the seeds ripen, the involucrum falls off, but the large loose-looking calyx remains on.
The involucrum is formed also of one piece, and the three leaves are laid one over the other as in the annexed flower.
It belongs to that section of its numerous genus having an involucrum of stalked leaflets.