. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. RESPONSE OF THE PLANT TO ITS SURROUNDINGS 285 humus. For similar reasons the vegetation of sandy bogs and sea beaches, owing to the poverty of the soil in nitrog- enous matter, usually develops xerophyte adaptations, even though there may be a superabundance of moisture. Plants growing on high mountain tops and in cold arctic bogs take on the same characteristics (Fig. 410). Such situa- tions are said to be " physiologically dry," because the moisture they have i
. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. RESPONSE OF THE PLANT TO ITS SURROUNDINGS 285 humus. For similar reasons the vegetation of sandy bogs and sea beaches, owing to the poverty of the soil in nitrog- enous matter, usually develops xerophyte adaptations, even though there may be a superabundance of moisture. Plants growing on high mountain tops and in cold arctic bogs take on the same characteristics (Fig. 410). Such situa- tions are said to be " physiologically dry," because the moisture they have is not in a condition to be readily ab-. Fig. 421.—A halophyte swamp of mangroves. Notice the tangle of adven- titious prop roots assisting in the work of absorption from the brackish marsh soil. (.From Mo. Botanical Garden Rep't.) sorbed. The vegetation of arctic regions suffers more from physiological drought than from cold. 323. Halophytes include plants growing by the seashore and the vegetation around salt springs and lakes and that of alkali deserts. Seaweeds are in a sense halophytes, since they live in salt water, but as they are true aquatic plants and exhibit many of the peculiarities of hydrophytes in their mechanical structure, they are classed with them. The name halophyte applies more particularly to land plants. 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 Andrews, Eliza Frances, b. 1840; Lloyd, Francis Ernest, 1868-1947. ed. New York, Cincinnati [etc. ] American book company
Size: 1871px × 1336px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorand, bookcentury1900, bookdecade1910, booksubjectbotany
