Adventitious

(1) Adventitious [ Botany ]

Dictionary of botanic terminology - index of names


	In botany any organ arising, in an abnormal, unusual or unexpected position or place.

Occurring away from its natural location, e.g. roots arising from the shoot system, buds from the roots or along a stem not in the usual place, generally in reaction to a wound. (For example an adventitious bud)

(2) Adventitious Or Adventive [ Ecology ]


	Out of the usual place, referring to an organism introduced accidentally in a new territory but not fully naturalized.

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994