floral organ meristem development stage PMID:2152125 plant_structure_development_stage 1 floral meristem visible (exact) PO_GIT:500 stage 1 flower in Arabidopsis (related) PO:0007601 A floral organ formation stage (PO:0025585) which begins with the development of the floral organ meristem (PO:0000229) from a portion of meristem tissue (PO:0009013) and ends with the beginning of the floral organ primordium development stage (PO:0007602). During this stage, the process of floral meristem growth (GO:0010451) occurs. This process is defined as the increase in size or mass of a floral meristem, a population of undifferentiated cells in a plant that gives rise to a flower. floral organ formation stage