Fusion of floral organs dictates evolutionary complexity, where connation joins similar parts like petals into a tube, and adnation fuses distinct whorls like stamens to petals.

The gynoecium configuration provides critical generic markers, defined by the number of carpels, whether they are free or fused, and the internal arrangement of ovules.

The androecium structure varies significantly, characterized by the number of stamens, the way anthers split open to release pollen, and filament length.

The perianth composition differentiates major families through the presence, absence, or modification of the outer calyx (sepals) and inner corolla (petals).

Floral symmetry serves as a primary split in identification keys, dividing plants into actinomorphic (radially symmetrical) or zygomorphic (bilaterally symmetrical) groups.

An underground storage organ that keeps food for the plant through the winter.