Is it possible only by the venation of the leaves to determine which plant is monocotyledonous or dicotyledonous.

As a rule, you can. If we see an arc or parallel venation on the surface of a leaf of a plant, then this is a monocotyledonous plant. Conversely, a more complex reticular leaf pattern indicates that this individual is dicotyledonous. Although there are exceptions in the form of the dicotyledonous plantain and the monocotyledonous crow’s eye.

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