Structures that make up shoot system(leaves)
Cuticle&epidermis=suberin(primary component, wax, prevents dessication), guard cells(pairs, controls open&closing of stomata, in cuticle), stomata(gases exchanged, guard cells with this).
Mesophyll(most ground tissue)=palisade(upper layer, rows) and spongy(bottom, less organized, air spaces allow for water vapor)
Vascular cylinders visible as veins, provides support, also transport of water&other materials, surrounded by bundle sheath.
Petiole attaches stem w/ leaf. Positions leaf in place(vertical) and connects vascular tissues of leaf with stem.