Any cup-shaped structure, such as the scaly to spiny "cup" associated with the nut of members of Fagaceae, or swollen receptacle and perianth parts usually associated with the drupe of members of Lauraceae.
cup-shaped anatomical structure, like that holding an acorn, which is made of hardened, joined bracts. See also: crateriform.
cup-shaped structure of hardened bracts at the base of an acorn
that in which an acorn rests.
cup-shaped vegetal wrapping that holds the kernels of an ear of maize
Fused involucral bracts subtending flower, as in Quercus.
A cupule is a fruit structure found in flowering plants in the family Fagaceae. It holds and protects the nut during its growth and maturation. In some genera (e.g.