The flowers are arrayed in a spiral around the inflorescence axis or branches, or occur singly, or in several ranks The petals or the sepals are fused into a cup or tube There is only one way to evenly divide the flower (the flower is bilaterally symmetrical) The flower has both pollen- and seed-producing parts The flower has a superior ovary, and lacks a hypanthium There are no cleistogamous flowers on the plan There are two or more ways to evenly divide the calyx (the calyx is radially symmetrical)