Adventitia

Adventitia

In botany, the term adventitia defines a species that grows and spreads in a restricted range, different from the primitive one and which often tends to disappear over time.
The term adventitia is also used in reference to plant organs originating in an atypical position, such as the root produced by a stem in an aerial position or in water, or that produced by leaves, or also as the accidental buds that are formed following a wound in positions other than typical ones.
The word adventitious occurs, in particular to describe those roots that are formed in particular conditions by parts of the plant other than the root (eg stem, branches, leaves) and which are defined adventitious roots.
The adventitious roots form the root system of many Poaceae and, appropriately modified with adhesive terminations, serve as anchors to often vertical substrates in some plants such as Ivy or, as in the case of some ficus, to contribute to the static stability of the plant.
Adventitious roots are heterotopic organs as they originate from tissues other than their own. Adventitious roots are present in: Monocotyledons, Lycophyta, Isoetes, Equisetales, Ferns, Bambuseae, etc ..