The gene regulatory networks involving auxin that orchestrate development of the different flower organs. A representation of an Arabidopsis flower linked to schematic diagrams to show how auxin integrates into the gene regulatory networks that coordinate gynoecium, stamen, petal, and sepal initiation and growth. An additional diagram shows the gene regulatory network involving auxin that relates to floral meristem (FM) determinacy and termination (see text for details). (AG) AGAMOUS, (ARF8/ARF17) AUXIN RESPONSE FACTOR7/17, (AUX1) AUXIN EFFLUX CARRIER1, (Aux/IAA19) AUX/IAA PROTEIN19, (AXR4) AUXIN-RESISTANT4, (CRC) CRABS CLAW, (DRMY1) DEVELOPMENT-RELATED MYB-LIKE1, (HAN) HANABA TARANU, (HEC1/HEC2/HEC3) HECATE1/2/3, (JAG) JAGGED, (KNU) KNUCKLES, (MYB26/MYB108) MYB-DOMAIN PROTEIN26/08, (SPT) SPATULA, (TMO3) TARGET OF MONOPTEROS3, (TRN) TORNADO, (WUS) WUSCHEL (see additional abbreviations in Fig. 1).