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<p>Abstract</p> <p>The circadian clock enhances fitness through temporal organization of plant gene expression, metabolism and physiology. Two recent studies, one in <it>BMC Evolutionary Biology</it>, demonstrate through phylogenetic analysis of the <it>CCA1</it>/<it>LHY </it>and <it>TOC1</it>/<it>PRR </it>gene families that the common ancestor of monocots and eudicots had components sufficient to construct a circadian clock consisting of multiple interlocked feedback loops.</p> <p>See research article http://www.biomedcentral.com/1471-2148/10/126</p>