Poikilohydric

Poikilohydric [ Botany ]	Dictionary of botanic terminology - index of names

Of a plant able to survive desiccation without damage and to resume growth soon after re-wetting.

The poikilohydric lifestyle:

Poikilohydry means that the organism relies directly on the environment for its water. As a result, the organism's water content tends to reach equilibrium with that of the environment. Poikilohydric organisms have no mechanisms to prevent desiccation: they desiccate, and remain dormant, when their environment dries out, but can rehydrate when water becomes available again. They usually absorb water directly through their body surface.
Poikilohydric organisms include some green algae, cyanobacteria (blue-green algae), lichens, and the bryophytes. A rare example of poikilohydric higher plant is Blossfeldia liliputiana

Advertising

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