Leaves originate from the shoot apical meristem, a small mound of undifferentiated tissue at the tip of the stem. Leaf formation begins with the selection of a group of founder cells in the so-called peripheral zone at the flank of the meristem, followed by the initiation of local growth and finally morphogenesis of the resulting bulge into a differentiated leaf. Auxin produced by the first leaf flow down and cause the second leaf bud to grow, auxin from leaf 2 causes leaf 3 to grow which in turn causes leaf 4 to grow.

Can you name the stages?