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Floral organs develop within a bud enclosed by previously formed organs, leaves, and axes. The tight junction among structures and the observation of contact margins and associated shapes in the bud suggest the influence of forces on the flower configuration. The rationale here is that the sections of the floral bud that are under higher pressure are delayed in the inception and growth of an organ or prevented from initiating, while areas with less pressure would have a more rapid organ initiation and growth.
The occurrence and reach of these forces can be categorized as: 1. Effects of bracts and inflorescence axis pressing against the flower meristem; 2. Effects of involucra in flowers, floral units, and inflorescences; 3. Within-flower organ interaction.