Pubescence

(1) Pubescence [ Botany ]
Adjective: Pubescent

Dictionary of botanic terminology - index of names


	A pubescence is fine covering of down or soft short hair, as on the surface of a leaf and other part of a plant.
The state of being pubescent of having such a covering. Disambiguation: The term pubescence is also used - in a more general meaning - to indicate collectively all the fine outgrowths or appendages on plant’s epidermis. Compare with: hairiness or trichomes

Pubescent [ Botany ]

A surface feature that can be found on many organs of a plant. Pubescent means somewhat covered with pubescence, or short, dense, soft downy hairs on the surface.

Pubescent spines of
Sclerocactus spinosior ssp. blainei

For example a peach, a leave of the African Violet or a spine of Sclerocactus spinosior ssp. blainei)

See: Surface features

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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