. Bulletin. Agriculture. 18 DIMORPHIC LEAVES IN RELATION TO HEREDITY. toward the simple form of leaves. The seed, iinfortimately, had all been picked, so that the inheritance of the variation could not be tested. The plant appeared unusually vigorous, but had the advan- tage of standing at the end of the row. Most of the leaves were simple and entire (fig. 11), only a few being three lobed and these with the lobes unusually short. A count showed 152 simple leaves and 41 with lobes. Some of the wild species of cotton have all the. Fig. 7.—Leaves of Upland cotton seedling from first seven nodes
. Bulletin. Agriculture. 18 DIMORPHIC LEAVES IN RELATION TO HEREDITY. toward the simple form of leaves. The seed, iinfortimately, had all been picked, so that the inheritance of the variation could not be tested. The plant appeared unusually vigorous, but had the advan- tage of standing at the end of the row. Most of the leaves were simple and entire (fig. 11), only a few being three lobed and these with the lobes unusually short. A count showed 152 simple leaves and 41 with lobes. Some of the wild species of cotton have all the. Fig. 7.—Leaves of Upland cotton seedling from first seven nodes above the cotyledons, showing changes of form. (Natural size.) leaves simple, and thus complete the correspondence with the simple- leaved Egyptian variety of Hibiscus cannahinus. The tendency to reduction of the lobes under greenhouse condi- tions represents another phase of the general jxirallelism of leaf forms. This tendency seems to be very general, not only in different varieties of Upland cotton, but also in the Egyptian and Sea Island types that in open-air conditions have the lo])os more highly tlcvel- oped than those of Upland cotton. The fruiting branches of green- 221. 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 United States. Bureau of Plant Industry. Washington : G. P. O.
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