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Pith, pith, n. the marrow or soft substance in the centre of the stems of dicotyledonous plants: force or energy: importance: condensed substance: quintessence.—n.

The chief home of the Coniferales is in the northern hemisphere, where certain species occasionally extend into the Arctic circle and penetrate beyond the northern limit of dicotyledonous trees.

Suppose there were no way to observe the development of two dicotyledonous plants from their seeds—the apple tree and the bean.

Still, the presence of dicotyledonous leaves, such as Magnolia alternans, in the Atanakerdluk strata, proves their close alliance with the Dakota series of the United States.

The bast tissues of dicotyledonous annuals furnish such staple materials as flax, hemp, rhea or ramie and jute.