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Floral development is one of the model systems for investigating the mechanisms underlying organogenesis in plants. Floral organ identity is controlled by the well-known ABC model, which has been generalized to many flowering plants. Here, we report a previously uncharacterized MYB-like gene,AGAMOUS-LIKE FLOWER(AGLF), involved in flower development in the model legumeMedicago truncatula. Loss-of-function ofAGLFresults in flowers with stamens and carpel transformed into extra whorls of petals and sepals. Compared with the loss-of-function mutant of the class C geneAGAMOUS(MtAG) inM. truncatula, the defects in floral organ identity are similar betweenaglfandmtag, but the floral indeterminacy is enhanced in theaglfmutant. Knockout ofAGLFin the mutants of the class A geneMtAP1or the class B geneMtPIleads to an addition of a loss-of-C-function phenotype, reflecting a conventional relationship ofAGLFwith the canonical A and B genes. Furthermore, we demonstrate thatAGLFactivatesMtAGin transcriptional levels in control of floral organ identity. These data shed light on the conserved and diverged molecular mechanisms that control flower development and morphology among plant species.