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Matorral Tamaulipeco  [ Ecology ]
(Tamaulipan shrublands)

Dictionary of botanic terminology - index of names

Mattoral espinoso tamaulipecoThe Matorral Tamaulipeco is an arid ecoregion dominated by xerophytic  shrubs  that lies in the lower elevations of the eastern Sierra Madre Oriental Mountains in north-eastern Mexico (northern Nuevo León, Coahuila, Tamaulipas) and southern Texas. The landscape undulates with mountains, hills, valleys, and vast plateaus. Where precipitation levels are below 100 cm per year.

The Tamaulipan Matorral is rich in plant and animal biodiversity. A high number of endemic cacti, and succulents such as Agave victoria-reginae and  Astrophytum caput-medusae, make it a priority area for the conservation of species.
Mattoral Espinoso TamaulipecoThe vegetation represents a transition from the desert scrub of the drier mezquital in the lowlands to the woodlands of the Sierras. The matorral of this zone is full of shrubs and small trees that can survive here with the benefit of more moisture from mountain storms. 

Matorral espinoso tamaulipeco (sub desert thorn shrub land)The desert shrublands are primarily threatened by agriculture, goat, sheep, and cattle grazing, and the expansion of urban areas. The destruction of this vegetation type is almost 90% in Texas and 70% in Mexico. Fires also destroy habitat when used as a means to convert the matorral to farms. Illegal extraction and trade of cacti have helped make several species endangered.

"Photo kindly provided by Manuel Nevarez de los Reyes"

 


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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
     

 

 

 

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