On the hills the baobab and hyphaene palm are characteristic; on the plateau are stretches of open savanna, and park-like country with clumps of silk cotton and shea-butter trees.
The city is built on a comparatively level pajonal or savanna, extending southward from the base of three low hills, called Los Cerros de la Cruz, between the river and the partially filled waters of the Estero Salado.
Isolated tufts or tussocks are also characteristic of steppe - and savanna - vegetation and open places generally in the warmer parts of the earth.
Many are savanna grasses, in various parts of the tropics, for instance the large genus Andropogon, Elionurus and others.
Elionurus, a widespread savanna grass in tropical and subtropical America, and also in the tropics of the old world, is rejected by cattle probably on account of its aromatic character, the spikelets having a strong balsam-like smell.