The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] 33 BUDS. [section 4. the Hose, Blackberry, and Raspberry. That is, these shoots are apt to grow all summer long, until stopped by the frosts of autumn or some other cause. Consequeatly they form and ripen no terminal bud protected by scales, and the- upper axillary buds are produced so late in the season that they have no time to mature, nor has their wood time to solidify and ripen. Such stems therefore commonly die back from the top in winter, or at least all their upper b
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] 33 BUDS. [section 4. the Hose, Blackberry, and Raspberry. That is, these shoots are apt to grow all summer long, until stopped by the frosts of autumn or some other cause. Consequeatly they form and ripen no terminal bud protected by scales, and the- upper axillary buds are produced so late in the season that they have no time to mature, nor has their wood time to solidify and ripen. Such stems therefore commonly die back from the top in winter, or at least all their upper buds are small and feeble; so the growth of the suc- ceeding year takes place mainly from the lower axillary buds, which are more mature. 63. Deliquescent and Excurrent Growth. In the former case, and wherever axillary buds take the lead, there is, of course, no single main stem, continued year after year in a direct line, but the trunk is soou lost in the branches. Trees so formed commonly have rounded or spreading tops. Of such trees with deliquescent stems, — tliat is, Avith the trunk dissolved, as it were, into the successively divided branches, — the common American Elm (Fig. 80) is a good illustration. 64. On the other hand, the main stem of Firs and Spruces, unless de- stroyed by some injury, is carried on in a direct line throughout the wljole growth of the tree, by the development year after year of a terminal bud : this forms a single, uninterrupted shaft, — an excurrent trunk, which can- not be confounded with the branches that proceed from it. Of such spiry or spire-shaped trees, the Firs or Spruces are characteristic and familiar examples There are all gradations between the two modes. FiQ. 80. An American Elm, with Spruce-trees, and on the left Arbor Vitse.
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