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Updated: May 13, 2025
There are no annular rings. If possible, let the pupils compare the leaves belonging to these different types of stems. The parallel-veined leaves of monocotyledons have stems without distinction of wood, bark and pith; the netted-veined leaves of dicotyledons have exogenous stems. Dicotyledons have bark, wood, and pith, and grow by producing a new ring of wood outside the old.
The actual objects make an impression that the cuts in the book cannot give. Let the pupils compare the distribution of the veins in their specimens. They have already distinguished parallel-veined from netted-veined leaves, and learned that this difference is a secondary distinction between monocotyledons and dicotyledons. The veins in netted-veined leaves are arranged in two ways.
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