noun, plural in·vo·lu·cra [in-vuh-loo-kruh] /ˌɪn vəˈlu krə/.
Origin of involucrum
Examples from the Web for involucrum
Historical Examples of involucrum
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.
It belongs to that section of its numerous genus having an involucrum of stalked leaflets.
The leaves are triternate, divisions deeply cut and acute; the leaves of the involucrum are stalked, trifid, and deeply cut.