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grape leaf 
lower lateral lobe
Somewhat rounded section of the blade located on the side of the leaf, in its lower quadrant.
upper lateral lobe
Somewhat rounded section of the blade located on the side of the leaf, in its upper quadrant.
terminal lobe
Somewhat rounded section of the blade comprising the apex of the leaf.
petiolar sinus
Indentation of the leaf’s main part, where it attaches to the petiole.
lower lateral sinus
Indentation of the leaf’s main part, separating the upper lateral lobe from the lower lateral lobe.
upper lateral sinus
Indentation of the leaf’s main part, separating the terminal lobe from the upper lateral lobe.
