calyptra


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  • noun

Words related to calyptra

the hood or cap covering the calyx of certain plants: e

References in periodicals archive ?
Calyx lobes ciliate, persistent; corolla sympetalous, cylindrical, the lobes either fused to form a calyptra that splits transversely and falls at anthesis to leave a persistent basal ring, or lobes free and the corolla tube sometimes constricted at the throat.
End cells rounded, sometimes capitates or with narrow calyptras.
Apical cell round, the outer membrane thickened but without definite calyptras.