Partaking of two natures, as the perianth of some endogenous plants, where the outer surface is calycine, and the inner petaloid.

Increased number of parts in the calycine, corolline, and carpellary whorls respectively.

Mussænda, Pinckneya, Calycophyllum, one or more of the calycine lobes are normally dilated and petaloid, the others remaining small and comparatively inconspicuous.