. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. VARIATIONS IN STRUCTURE 277 of perfectly distinct kinds, all alike as to function, but all different as to structure. The kinds of flowers are not only more easily distinguished from one another than the kinds of leaves and other organs, but flowers of the same kind of plant do not vary as the it- leaves and other organs of the same kind of plant vary. (See Figure 100.) On different kinds of plants, flowers vary much more than leaves, but on the same kind
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. VARIATIONS IN STRUCTURE 277 of perfectly distinct kinds, all alike as to function, but all different as to structure. The kinds of flowers are not only more easily distinguished from one another than the kinds of leaves and other organs, but flowers of the same kind of plant do not vary as the it- leaves and other organs of the same kind of plant vary. (See Figure 100.) On different kinds of plants, flowers vary much more than leaves, but on the same kind they vary much less. On dry, sandy soil a wild rose has small leaves, short stems, and many thorns; on rich soil it has larger leaves, longer stems, and fewer thorns. But wherever it grows the flower is practically the same. It is a general princi- ple that surrounding conditions affect the structure of nutritive organs more than they affect the structure of reproductive organs. Evidently, then, reproductive or- gans, being less variable, are more useful in classification. Fig. 100. — Variation in the dandelion. Both plants are mature. The smaller one was grown from a portion of the larger one, but under less favorable conditions. The stems and leaves are very different in the two specimens, but the flowers are about the 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 Coulter, John G. (John Gaylord), b. 1876. New York, American Book Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
