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Term Definition
Midrib Referring to the princiipal or primary vein of a leaf blade that runs from the base of the leaf blade along the middle to the apex of the leaf blade. Leaf venation of a species of Eschweilera. Photo by S. A. Mori.
Midrib plane adaxially A midrib rib that is neither salient or impressed toward the base of the adaxial side of the leaf blade, i.e., it is flat with the leaf blade surface. Midrib section of Couratari asterophora. Photo by S. A. Mori.
Midrib square abaxially A midrib that appears to be square on the abaxial side of the leaf blade. Midrib section of Couratari asterophora. Photo by S. A. Mori.