Probable transcription factor that binds to the DNA sequence 5'-GCATTAAATGC-3' (PubMed:16778018). Seems to promote cell differentiation (PubMed:25564655). Interacts with AIL7/PLT7. Expressed in cells around the base of leaf primordia, in the outermost 2 to 3 cell layers along the boundary between two leaf primordia. Expressed in lateral root primordia and tips, and in the epidermal boundaries of two cotyledons at heart-stage embryo. In plants missing HDG3, HDG7, HDG11, PDF2 and ATML1, increased cell division leading to cell overproliferation. Belongs to the HD-ZIP homeobox family. Class IV subfamily.