Practice question

Zygomorphy denotes derived bilateral symmetry where floral parts can be divided into mirror halves only along one median vertical plane, evolutionarily associated with specialized pollinator interactions and efficient pollen transfer, typical of Fabaceae with banner, wing, keel architecture, Lamiaceae with bilabiate corolla and Orchidaceae with highly modified labellum. In classical floral formula notation introduced by German botanists, % or sometimes ÷ or upward arrow corresponds to zygomorphic condition. Actinomorphic radial symmetry denoted by ⊕, indefinite number by ∞, fused whorls by parentheses. Differentiating symbols clarifies pollination syndrome.