Here the involucre, in the form of a cup at the base, is called the cupule.
In the Chestnut the cupule forms the bur; in the Hazel, a leafy husk.
The latter are in clusters of a few only, and each separate flower is enclosed in a cupule of overlapping scales.
These cylindrical muscles with their cupule and tendon look like so many syringes.
Among the specimens of the last class, one sort, the cupule, is extremely widespread.