The popular idea of a desert of dry drifting sand unrelieved except at occasional oases by evidences of life was born of our early geographies, which pictured the Sahara as the desert type. Far different indeed is our American desert, most of which has a few inches of rainfall in the early spring and grows a peculiar flora of remarkable individuality and beauty. The creosote bush seen from the car-windows shelters a few grasses which brown and die by summer, but help to color the landscape the year around. Many low flowering plants gladden the desert springtime, and in the far south and particularly in the far southwest are several varieties of cactus which attain great size. The frequenter of the desert soon correlates its flora with its other scenic elements and finds all rich and beautiful.
In southwestern Arizona and along the southern border of California this strange flora finds its fullest expression. Here one enters a new fairy-land, a region of stinging bushes and upstanding monsters lifting ungainly arms to heaven. In 1914, to conserve one of the many rich tracts of desert flora, President Wilson created the Papago Saguaro National Monument a few miles east of Phœnix, Arizona. Its two thousand and fifty acres include fine examples of innumerable desert species in fullest development.
Among these the cholla is at once one of the most fascinating and the most exasperating. It belongs to the prickly pear family, but there resemblance ceases. It is a stocky bush two or three feet high covered with balls of flattened powerful sharp-pointed needles which will penetrate even a heavy shoe. In November these fall, strewing the ground with spiny indestructible weapons. There are many varieties of chollas and all are decorative. The tree cholla grows from seven to ten feet in height, a splendid showy feature of the desert slopes, and the home, fortress, and sure defense for all the birds who can find nest-room behind its bristling breastwork.
The Cereus thurberi, the pipe-organ, or candelabrum cactus, as it is variously called, grows in thick straight columns often clumped closely together, a picturesque and beautiful creation. Groups range from a few inches to many feet in height. One clump of twenty-two stems has been reported, the largest stem of which was twenty feet high and twenty-two inches in diameter.
Another of picturesque appeal is the bisnaga or barrel cactus, of which there are many species of many sizes. Like all cacti, it absorbs water during the brief wet season and stores it for future use. A specimen the size of a flour-barrel can be made to yield a couple of gallons of sweetish but refreshing water, whereby many a life has been saved in the sandy wastes.
But the desert's chief exhibit is the giant saguaro, the Cereus giganteus, from which the reservation got its name. This stately cactus rises in a splendid green column, accordion-plaited and decorated with star-like clusters of spines upon the edges of the plaits. The larger specimens grow as high as sixty or seventy feet and throw out at intervals powerful branches which bend sharply upward; sometimes there are as many as eight or nine of these gigantic branches.
No towering fir or spreading oak carries a more princely air. A forest of giant saguaro rising from a painted desert far above the tangle of creosote-bush, mesquite, cholla, bisnaga, and scores of other strange growths of a land of strange attractions is a spectacle to stir the blood and to remember for a lifetime.
Colorado National Monument
On the desert border of far-western Colorado near Grand Junction is a region of red sandstone which the erosion of the ages has carved into innumerable strange and grotesque shapes. Once a great plain, then a group of mesas, now it has become a city of grotesque monuments. Those who have seen the Garden of the Gods near Colorado Springs can imagine it multiplied many times in size, grotesqueness, complexity, and area; such a vision will approximate the Colorado National Monument. The two regions have other relations in common, for as the Garden of the Gods flanks the Rockies' eastern slopes and looks eastward to the great plains, so does the Colorado National Monument flank the Rockies' western desert. Both are the disclosure by erosion of similar strata of red sandstone which may have been more or less continuous before the great Rockies wrinkled, lifted, and burst upward between them.
The rock monuments of this group are extremely highly colored. They rise in several neighboring canyons and some of them are of great height and fantastic design. One is a nearly circular column with a diameter of a hundred feet at the base and a height of more than four hundred feet.