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.