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leaf
another plant organ that, along with stems, constitutes the shoot of the plant body and its principal function is to act as the main site of photosynthesis in a plant.
blade
a flattened laminar portion of the leaf
petiole
a stalk on the leaf which attaches the blade to the stem
stipules
small leaf-like structures which develop in pairs on each side of the leaf during the growing season
midrib
blade or lamina is lined with the veins; the middle portion of the blade usually has a prominent central vein
netted venation
arrangement of veins in dicots
parallel venation
arrangement of veins in monocot
margin
also known as the edge of the blade
apex
also known as leaf tip
simple
type of leaf that has a single blade or lamina
compound
type of leaf that is composed of two or more separate leaflets.
epidermis
outermost layer of cells and secrete a waxy substance which forms a covering over the outer dermal cells rendering these cells impermeable to water.
cuticle
waxy covering
stomates
openings in the epidermis
guard cells
specialized epidermal cells
palisade layer
the cells toward the upper epidermis, which are elongated
spongy layer
the zone below the palisade layer, composed of irregularly shaped cells
Note 
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