Sometimes the androecium acyclic. Floral receptacle developing an androphore, or with neither androphore nor gynophore. Free hypanthium absent. Hypogynous disk absent. Epicalyx present, or absent.
Petals deeply bifid, or entire.
Androecium exclusively of fertile stamens, or including staminodes. Endothecium developing fibrous thickenings. Anther epidermis persistent. The initial microspore tetrads tetrahedral. Carpels isomerous with the perianth, or reduced in number relative to the perianth, or increased in number relative to the perianth.