The chief value of the agaves, however, is in their fibres, of which a great variety is produced.
Some fine aloes or agaves are also found.
The most common plants of the Mexican plateau are the agaves, yuccas and cacti, each of which is represented by a number of species.
There is some confusion in the specific names of these agaves; the " pulque "-producing plant is usually described as the Agave americana, though A.
The principal plateau agaves producing fibre are the A.
There are many other fibre-producing agaves, including some of those from which pulque is derived.
There are other agaves used both in the production of drinks and fibres, but they are not cultivated.
The " ixtle " fibres shipped from Tampico and Chiapas are all obtained from the agaves and yuccas found growing wild.
The Lower Sonoran zone is noted for its cactuses, of which there is a great variety, and some of them grow to the height of trees; the mesquite is also very large, and the creosote bush, acacias, yuccas and agaves are common.
In the arid portions of this and the tropic areas the indigenous plants are creosote, mesquite and alfileria bushes, desert acacias, paloverdes, alkali-heath, salt grass, agaves, yuccas (especially the Spanish-bayonet and Joshua tree) and cactuses.
In the Lower Sonoran belt, soapweed, acacias (Palo Verde or Parkinsonia torreyana), agaves, yuccas and dasylirions, the creosote bush and mesquite tree, candle wood, and about seventy-five species of cactuses - among them omnipresent opuntiae and great columnar " Chayas " - make up a striking vegetation, which in its colours of dull grey and olive harmonizes well with the rigidity and forbidding barrenness of the plains.
Among other economic plants are the fibre-producing agaves, the best known of which is the A.