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The two guard cells of a stoma are produced by a single symmetric division just before terminal differentiation. Recessive mutations in the FOUR LIPS (FLP) gene result in abnormal contact between at least four guard cells due to extra symmetric divisions at the end of the cell lineage. Lai et al. (pages 2754 - 2767) show that FLP and the related gene MYB88 have overlapping function in restricting divisions late in the stomatal cell lineage and encode a distinct and relatively basal clade of atypical R2R3 MYB proteins with a unique DNA binding domain. The cover is a cryoscanning electron microscope image of the sepal of an flp mutant showing abnormal stomatal clusters.