The royal pinon (Erytlrrina velatina) is remarkable for the magnificent purple flowers that cover it.
In very limited spaces on other mountains there are scattered trees - the pinon (nut pine) and the juniper at an altitude between 5000 and 7000 ft.
The lower slopes are usually covered with the scrub oak, juniper and pinon; but some mountains, especially those along the eastern border of the Rio Grande Valley, are absolutely treeless.
There are firs and spruces on the mountains, characteristic of the Boreal zone; pines characteristic of the Transition zone; pinon juniper, greasewood and the universally conspicuous sage-brush, characteristic of the Upper Sonoran zone.
18 Oaks, juniper, pinon, cedars, yellow pine, fir and spruce grow on the mountains and over large areas of the plateau country.'