. Introduction to botany. Botany. Plants of Different Regions. 345. Fig. 187. Zilla spinosa, slightly reduced. From the Sa- hara desert. After Prantl. growth, the rings having an average breadth of millimeter. The polar regions possess no families of plants peculiar to them- selves, the plants which appear there being dwarfed and xerophytic representatives of fami- lies which dominate the north temperate zone. 217. Vegetation of Desert Regions. — The deserts occupy a consid- erable area of the earth. In north Africa the Sa- hara desert alone nearly equals the United States in size, and it
. Introduction to botany. Botany. Plants of Different Regions. 345. Fig. 187. Zilla spinosa, slightly reduced. From the Sa- hara desert. After Prantl. growth, the rings having an average breadth of millimeter. The polar regions possess no families of plants peculiar to them- selves, the plants which appear there being dwarfed and xerophytic representatives of fami- lies which dominate the north temperate zone. 217. Vegetation of Desert Regions. — The deserts occupy a consid- erable area of the earth. In north Africa the Sa- hara desert alone nearly equals the United States in size, and its area is more than doubled by the deserts of Ara- bia and of south and central Asia. To this must be added a large tract between the Sierra Nevada and Rocky Moun- tains, a narrow strip east of the Rocky Mountains, a large portion of central and south- western Australia, and a nar- row strip along the western border and in the south cen- tral part of South America. The total area of these desert regions equals approximately the area of the North Ameri-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, William Chase, 1861-. Boston, D. C. Heath & Co.
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