. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. SECTION 5.] ROOTS. 35 and their soft and tender tips harden. Prom this period, therefore, until growth begins anew the next spring, is the best time for transplanting; especially for trees and shrubs. 73. The absorbing surface of young roots is much increased by the for- mation, near their tips, of Root-haies (Fig. 81, 82), which are delicate. tubular outgrowths from the surface, through the delicate walls of which moistur
. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. SECTION 5.] ROOTS. 35 and their soft and tender tips harden. Prom this period, therefore, until growth begins anew the next spring, is the best time for transplanting; especially for trees and shrubs. 73. The absorbing surface of young roots is much increased by the for- mation, near their tips, of Root-haies (Fig. 81, 82), which are delicate. tubular outgrowths from the surface, through the delicate walls of which moisture is promptly imbibed. 74. Fleshy Boots are those in which the root becomes a storehouse of nourishment. Typical roots of this kind are those of such biennials as the turnip and carrot; in which the food created in the first season's vege- tation is accumulafed, to be expended the next season in a vigorous growtli and a rapid development of flowers, fruit, and seed. By the time the seed is matured the exhausted root dies, and with it the whole plant. 75. Pleshy roots may be single or multiple. The single root of the commoner- biennials is the primary root, or tap-root, which begins to tliickeu in the seedling. Names are given to its shapes, such as Conical, when it thickens most at the crown, or wliere it joins the stem, and tapers regularly downwards to a point, as in the Parsnip and Carrot (Fig. 84) ; Turnip-shaped <yc napiform, when greatly thickened above, but abruptly bcconimg slender below; as the Turnip (Fig. 83) ; and FiQ. 86. Sweet-Potato plant forming thickened roots. Some in the middle are just beginning to thicken; one at the left has grown more; one at the right is still larger. Fia. 87. Pasoioled fusiform roots of a Dahlia: a, a, buds on base of 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 origina
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
