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Lamina  (Plural: Laminae ) [ Botany ]
Synonym: Leaf blade
Adjective: Laminar

Dictionary of botanic terminology - index of names

  A thin, flat, blade-like organ, part or expansion. (e.g. the blade of a leaf or petal)  
[ From Latin. "lamina" a blade or a thin plate ]

Any thin, flat layer or sheet of membrane or other tissue. It may be a  part of a larger structure.

Lamina of the leaf (Blade)    [ Botany]
The lamina is the expanded portion or blade of a leaf and it is an above-ground organ specialized for photosynthesis. For this purpose, a leaf is typically, to a greater or lesser degree, flat and thin, to expose the chloroplast containing cells (chlorenchyma) to light over a broad area, and to allow light to penetrate fully into the tissues.

Lamina parts:

Leaf apex: The tip of a leaf opposite to the petiole.
Margins:  The boundary area extending along the edge of the leaf.
Lobes: A partial rounded portion of a leaf margin, separated from the whole by a more or less deeply indentation (sinus)
Vein: A vascular bundle (the ribs)  at or near the surface  that provides supports for the leaf and transports both water and food.

The Adaxial or ventral surface: is the upper surface of a leaf lamina facing toward the stem.
The Abaxial or dorsal surface: of a leaf lamina is the underside or side facing away from the stem.

The shape or form of the leaf lamina is an important characteristic used for leaf classification. See:  leaf shape





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