. Foundations of botany. Botany; Botany. BUDS 127 important purposes to be served; the leaves must be stowed as closely as possible in the bud, and upon begin- ning to open they must be protected from too great heat and dryness until they have reached a certain degree of firmness. It may be inferred from Fig. 87, I, that it is common for very young leaves to stand vertically. This protects them considerably from the scorching effect of the sun at the hottest part of the day. Many young leaves, as, for instance, those of the silver-leafed poplar, the pear, the beech, and the mountain ash, are s
. Foundations of botany. Botany; Botany. BUDS 127 important purposes to be served; the leaves must be stowed as closely as possible in the bud, and upon begin- ning to open they must be protected from too great heat and dryness until they have reached a certain degree of firmness. It may be inferred from Fig. 87, I, that it is common for very young leaves to stand vertically. This protects them considerably from the scorching effect of the sun at the hottest part of the day. Many young leaves, as, for instance, those of the silver-leafed poplar, the pear, the beech, and the mountain ash, are sheltered and pro-. -4!] BCD Fig. 87, H. — Development of an Oxalia Leaf. A, full-grown leaf; J, rudimentary leaf, the leaflets not yet eyident; C, more advanced stage, the leaflets appearing; i), a still more advanced stage; B, C, and D, considerably magnified. tected from the attacks of small insects by a coating of wool or down, which they afterwards lose. Those of the tulip tree are enclosed for a little time in thin pouches, which serve as bud-scales, and thus entirely shielded from direct contact with the outside air (see Sect. 117). 138. Dormant Buds. — Generally some of the buds on a branch remain undeveloped in the spring, when the other buds are beginning to grow, and this inactive condition may last for many seasons. Finally the bud may die, or some injury to the tree may destroy so many other buds as to leave the dormant ones an extra supply of food, and. 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
