. Foundations of botany. Botany; Botany. BOTAOTCAL GEOGRAPHY 327 (Ammophila) of the Atlantic coast and the great lakes, will continue to grow upward as the sand is piled about them by the winds until they have risen to a level of a hundred feet above the start- ing point. Peat bogs are especially characterized by the predominance of the peat mosses (Fig. 231) from which they take their name. These plants and the others which associ- ate with them are mostly hydrophytes, living usually with a considerable portion of the plant continually submerged in the bog water. The water of such bogs contai
. Foundations of botany. Botany; Botany. BOTAOTCAL GEOGRAPHY 327 (Ammophila) of the Atlantic coast and the great lakes, will continue to grow upward as the sand is piled about them by the winds until they have risen to a level of a hundred feet above the start- ing point. Peat bogs are especially characterized by the predominance of the peat mosses (Fig. 231) from which they take their name. These plants and the others which associ- ate with them are mostly hydrophytes, living usually with a considerable portion of the plant continually submerged in the bog water. The water of such bogs contains little mineral matter and only a very scanty supply of nitrogen, in the form of nitrates dissolved in it. The bog-plants, therefore, must either get on with an exceptionally small supply of nitrogen or they must get it from an unusual source. The peat mosses adopt the former alternative, while the sun dews (Fig. 238), the pitcher-plants (Fig. 237), and some other species adopt the latter and derive their nitrogen supply largely from insects which they catch, kill, and digest. 399. Arctic Vegetation. — The seed-plants of the arctic flora are mostly perennials, never trees. By the large bulk of the underground portion as compared with that of the part above ground, they are adapted to a climate in which they must lie dormant. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Eastwood, Alice, 1859-1953. Boston, Ginn & Co.
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