The cactus is unquestionably the characteristic plant of Mexico.
The variation is from dwarf mountain pine to giant cactus and dates.
The entire valley of the Rio Grande, from El Paso to Brownsville, grows many species of cactus, and other prickly coriaceous shrubs.
Cactus and yucca occur in the west.
There are broad plains covered with salt and alkali, and others supporting only scattered bunch grass, sage bush, cactus and other arid land plants.