Pallipes, are restricted to the alpine zones of the Andes from the northern boundary of Peru to the southern parts of Chili; while Lagostomus trichodactylus (or Viscaccia viscaccia), the viscacha, is confined to the pampas from the Uruguay river to the Rio Negro.
Evidence of this is to be found in the altitudes of the stations on the Buenos Aires and Pacific railway running a little north of west across the pampas to Mendoza.
The plains are covered by a formation similar to that of the Argentine pampas and by the alluvial deposits of the present rivers.
Paspalum, is a large tropical genus, most abundant in America, especially on the pampas and campos; many species are good forage plants, and the grain is sometimes used for food.
Viscachas inhabit the South American pampas between the Uruguay river and the Rio Negro in Patagonia, where they dwell in warrens covering from loo to 200 sq.
On the southern margin of the pampas are the Colorado and Negro, both large, navigable rivers flowing entirely across the republic from the Andes to the Atlantic. Many of the rivers of Argentina, as implied by their names (Salado and Saladillo), are saline or brackish in character, and are of slight use in the pastoral and agricultural industries of the country.
The climate of the pampas is temperate and healthy, and is admirably suited to agricultural and pastoral pursuits.
The pampas were almost destitute of animal life before the horses and cattle of the Spanish invaders were there turned out to graze, and the puma and jaguar never came there until the herds of European cattle attracted them.
In the north and on the pampas the north wind is hot and depressing, while the south wind is cool and refreshing.
The flora of Argentina should be studied according to natural zones corresponding to the physical divisions of the country - the rich tropical and sub-tropical regions of the north, the treeless pampas of the centre, the desert steppes of the south, and the arid plateaus of the north-west.