Cade mounted a gray gelding and they headed out across the treeless hills.
In the upper part of the river the reservoirs are partially protected by curtains of verdure from the effects of the evaporation which makes itself so severely felt on the treeless seaboard.
It is chiefly a prairie region, with treeless plains of from 5 to 40 m.
The remainder of the great Argentine plain is the treeless, grassy pampa (Quichua for " level spaces "), apparently a dead level, but in reality rising gradually from the Atlantic westward toward the Andes.
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.
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