Line-drawing displaying variation of the leaf upper epidermis a type I, displaying the non-reticulate periclinal wall, the polygonal cells, and the round to polygonal cell shape b type II, displaying the sinuous anticlinal wall, the irregular cell shape, and the reticulate periclinal wall c type II, displaying an extremely sinuous anticlinal wall, the irregular cell shape, and the reticulate periclinal wall d type II, displaying the straight or nearly so anticlinal wall, the polygonal cell shape, and the reticulate periclinal wall.