. Introduction to botany. Botany. THE STEM AND THE LEAF 61 per year continues to increase, and then diminishes. For ex- ample, the long-leaf pine (fig. 229) grows only about | inch the first year. For the first fifty years it makes an average annual growth of 14 or 15 uiches; for the next fifty years, 4 or 5 inches; and from one hundred years to extreme old age, about 11 inches. It usually lives about two hundred Fig. 41. An isolated white oak tree destroyed by a violent windstorm Photograph by Paul Sargent The growth of the younger portions of most plants is quite unequal, as may be l
. Introduction to botany. Botany. THE STEM AND THE LEAF 61 per year continues to increase, and then diminishes. For ex- ample, the long-leaf pine (fig. 229) grows only about | inch the first year. For the first fifty years it makes an average annual growth of 14 or 15 uiches; for the next fifty years, 4 or 5 inches; and from one hundred years to extreme old age, about 11 inches. It usually lives about two hundred Fig. 41. An isolated white oak tree destroyed by a violent windstorm Photograph by Paul Sargent The growth of the younger portions of most plants is quite unequal, as may be learned from the study of a rapidly growing stem, such as the morning-glory.^ It will also prove interesting to measure such plants as corn, broom corn, hemp, and pole beans, to determine whether they elongate more by day or by night, and during warm or during cool weather. 1 For an illustration of this unequal growth, Practical Botany, p. 17. Ginn and Company, see Bergen and Davis, 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; Caldwell, Otis William, 1869- joint author. Boston, New York, [etc. ] Ginn and company
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