. The American botanist : a monthly journal for the plant lover. Plants; Plants -- United States. Fig 2. though mature and appearing at a later period of growth of the plant, has not developed i)eyond the stage represented by the cotyledon. On the other hand, its great difference from the normal leaf of this variety of morning-glory may be seen by compar- ing it with figure 3. In this case a single leaf only was involved, though several similar leaves were afterwards found on different plants. Sometimes, however, all the leaves of a given tree or plant are thus retarded As is well known, the f
. The American botanist : a monthly journal for the plant lover. Plants; Plants -- United States. Fig 2. though mature and appearing at a later period of growth of the plant, has not developed i)eyond the stage represented by the cotyledon. On the other hand, its great difference from the normal leaf of this variety of morning-glory may be seen by compar- ing it with figure 3. In this case a single leaf only was involved, though several similar leaves were afterwards found on different plants. Sometimes, however, all the leaves of a given tree or plant are thus retarded As is well known, the first leaves put forth by the seedling sassa- fras are the simple, non-lobed forms, the lobed forms appearing later. This is also true of the individual branches, on each of which the lower leaves are simple, while those of the median portion, and some- times those of the upper portion also are lobed, though frequently the uppermost zone of leaves is simple. It therefore appears reasonable to consider such simple leaves as may be found occupying the median portion of the branch as retarded forms. A splendid example of this kind of retarda- tion is a sassafras tree growing in Bronx Park, New York City. It is between ten and fifteen feet high and for two seasons has been practically covered with simple leaves. Last season less than half a dozen lobed forms could be seen, while the season before none were 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 Clute, Willard Nelson, b. 1869. Binghamton, N. Y. : Willard N. Clute & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpl, booksubjectplants
