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Exogen (Noun)

Flowering plant with two cotyledons; the stem grows by deposit on its outside.

Nouns denoting plants.

The seed of a dicotyledonous plant, such as a bean, is an example of an exogen that has two distinct cotyledons that emerge from the soil.
As the stem grows, it increases in length by adding new cells outside of its existing cells, making it an example of an exogen.
Unlike monocots, which are endogenously growing stems that have their increase confined to an interior part, dicots are exogenously growing stems that have it on its exterior part.
In flowering plants, the exogen, or the exteriorly growing stem, grows through an intertidal longitudinal exteriorly growing process of adding cells on its outer end, rather than interiorly like monocots.
Beans have exogenic growth pattern that increases the stem length by depositing new cells on the outside of the stem.