Its climatic diversity is reflected in the distribution of the flora, accompanied by the heights. The foot of summits is covered by arboreal species like the cebil, timbó, viraró and the drunk wood along with gramíneas. Over the 1,200 meters they predominate tipa, the laurel, the cedar and ceibo salteño. The lianas and epifitas are diminishing as the height is greater. Over the 1,500 meters of height it arises the alder and quinoa.

In the level zones of the northeast, with tropical climatic characteristics, the precipitations only occur in summer and invier to us they are dry, a forest extends that identifies with the forest formoseña in the north and with the forest chaqueño in the south. In her they appear viraros, white quebrachos colored, lapachos, woods, laurels and cebiles, in the shores of the rivers is common to find abundance in species like the willow, palms pindó and yatay. Next to the Chaco he is less rich in species, in him predominate the wood santo, guayacán, the yellow laurel, viraró, the drunk wood, the mataco wood, the carob tree, the cutting, ñandubay and jacarandá.

The Carob tree is the tree most characteristic of the Argentine Northwest. In quechua the flame I mark myself, that means tree. It reaches the 10 meters of height, and has a trunk that can get to measure a meter of diameter. It blooms in spring. Its fruit is a case of brown color, about 20 centimeters in length and forms bending, rich in sugar, starch, proteins and cellulose. It is used as forage to feed the cattle and with the flour of his seeds they prepare patay and the metheglin. The seeds in addition are used in popular medicine and like sucedáneo of the coffee. The wood, lasts and of reddish color very it is used in mueblería.

Cactaceous of great stature, ucle and the quimil, are present whereas in the open spaces the scrubs of caraguatá proliferate. The Teasel is a cactaceous one that is developed between the 2,000 and 3,500 meters of altitude. It blooms to the 40 years of age, during the months of October and November and their flowers are of white color in plume form. The called fruit pasacana is eatable. The pasacana comprised of the feeding of the natives and at the moment it is used like food for the cattle. The particularitity of its fruits is that 8,000 seeds have each one of which single a few will germinate, the growth of the plant is very slow, grows of one to five centimeters annual, whenever it can make it under the protection of a plant airplane underneath which it grows to the shelter of the sun and the frosts. The wood of the teasel was used to throw the Hispanic rooms and the jesuitas chapels, where also was used it for the construction of banks, confesionarios and floors. Of the hollowed teasel drums become. The teasel is in danger of extinction in the Argentine Northwest, thus has been created the National Park the Teasels for its protection.