The invention relates to plant transcription factor polypeptides, polynucleotides that encode them, homologs from a variety of plant species, and methods of using the polynucleotides and polypeptides to produce transgenic plants having advantageous properties compared to a reference or control plant, including increased plant size, seed size, increased leaf size, lignification, water deprivation tolerance, cold tolerance, or altered flowering time. Sequence information related to these polynucleotides and polypeptides can also be used in bioinformatic search methods and is also disclosed.