. Botany for high schools. Botany. PLANT SOCIETIES 447 ground the " bunch " grasses, like buffalo grass, beard-grass, or broom-sedge, etc., are dominant, and in the drier regions as one approaches desert conditions the vegetation gradually takes on more the character of the desert, so that in the plains, sage-brush,. Fig. 408. Winter range in northwestern Xevada. showing open formations: white sage (Eurotia lanata) in foreground, salt-bush (Atriplex confertifoHa) and bud-sage (Artemisia spinescens) at base of hill, red sage (Kochia americana) on the higher slope. (After GriflSths, Bu
. Botany for high schools. Botany. PLANT SOCIETIES 447 ground the " bunch " grasses, like buffalo grass, beard-grass, or broom-sedge, etc., are dominant, and in the drier regions as one approaches desert conditions the vegetation gradually takes on more the character of the desert, so that in the plains, sage-brush,. Fig. 408. Winter range in northwestern Xevada. showing open formations: white sage (Eurotia lanata) in foreground, salt-bush (Atriplex confertifoHa) and bud-sage (Artemisia spinescens) at base of hill, red sage (Kochia americana) on the higher slope. (After GriflSths, Bull. 38, Bureau Plant Ind., U. S. Dept. Agr.) the prickly-pear cactus, etc., occur. Besides the dominant vege- tation of the society there are subordinate species, and the societies are especially marked by a spring and autumn flora of conspicuous flowering plants which are mixed with the grasses. 634. Desert societies.—These are composed of plants which possess a form or structure enabling them to exist in a \Qry dry climate where the air is very dry and the soil contains but little moisture. The true desert plants are perennial. The growth and flowering period occurs during the rainy season, or those portions of the rainy season when the temperature is favorable, and the plants rest during the very dry season and cold. Charac- teristic desert plants are the cacti with thick succulent green stems or massive trunks, the leaves being absent or reduced to mere spines which no longer function in photosynthesis; yuccas. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
