Balsas dry forests
Balsas dry forests
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Balsas dry forests

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Balsas dry forests

The Balsas dry forests is a tropical dry broadleaf forest ecoregion located in western and central Mexico.

The Balsas dry forests occupy the basin of the Balsas River. The ecoregion covers an area of 62,400 square kilometers (24,100 sq mi). The Balsas basin, and the Balsas dry forests, extend east and west between the ranges of the Trans-Mexican Volcanic Belt to the north and the Sierra Madre del Sur to the south.

The Balsas dry forests ecoregion extends across portions of the states of Michoacán, Guerrero, Mexico, Morelos, Puebla, and Oaxaca.

The surrounding mountains are home to pine-oak forests: the Trans-Mexican Volcanic Belt pine-oak forests to the north and northwest, the Sierra Madre del Sur pine-oak forests to the south, and the Sierra Madre de Oaxaca pine-oak forests to the east. The xeric Tehuacán Valley matorral lies to the northeast. The Balsas dry forests meet the coastal Southern Pacific dry forests where the Balsas breaks through the Sierra Madre del Sur on its way to the Pacific Ocean.

The climate of the Balsas dry forests is tropical and subhumid. Rainfall is less than 120 centimeters (47 inches) per year and seasonal, with a dry season that can last up to eight months.

Plant communities include tropical deciduous forest (selva baja caducifolia or bosque tropical caducifolio) and thorn forest (bosque espinoso), with tropical semideciduous forest (selva mediana subcaducifolia or subperennifolia) in drainages and other areas with deeper soils and more soil moisture.

Characteristic trees include several species of BurseraBursera longipes, B. morelensis, B.odorata, etc. – commonly known as palo mulato, fragrant bursera (Bursera fagaroides), and chupandra (Cyrtocarpa procera). Other common trees include pochote (Ceiba parvifolia), brasiletto or mexican logwood (Haematoxylum brasiletto), Lysiloma microphylla, and cazahuate (Ipomoea murucoides). Cacti are common, including species of Pachycereus and Cephalocereus.

The herbaceous layer is generally sparse, with the grasses sideoats grama (Bouteloua curtipendula), Rothrock's grama (Bouteloua barbata var. rothrockii), and Hilaria semplei.

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