noun, plural in·vo·lu·cra [in-vuh-loo-kruh] /ˌɪn vəˈlu krə/.
- involuntary muscle,
- involute gear,
- involute teeth
Origin of involucrum
Examples from the Web for involucrum
In the genus Malva, the involucrum consists of three leaflets, which in the common Mallow (Malva sylvestris) are oblong.Botany for Ladies|Jane Loudon
Said involucrum is composed of numerous small leaves, a distinguishing trait from its nearest relative genus Rudbeckia.
The involucrum is formed also of one piece, and the three leaves are laid one over the other as in the annexed flower.A Complete Guide to the Ornamental Leather Work|James Revell
It belongs to that section of its numerous genus having an involucrum of stalked leaflets.
A little later the involucrum becomes developed, and is no unimportant feature.