. Botany, with agricultural applications. Botany. CHAPTER XXII VARIATIONS General Discussion. — Variations refer to the differences between individual organisms. Variability is the most con- spicuous feature among living beings. There is no organism, simple or complex in structure and function, that is the exact duplicate of another organism. Nature never produces two individuals that are exactly alike. In a field of wheat, corn, or in a group of any of our cultivated or wild plants, however numerous the plants of the group may be, no individual can be found that does not differ in a number of
. Botany, with agricultural applications. Botany. CHAPTER XXII VARIATIONS General Discussion. — Variations refer to the differences between individual organisms. Variability is the most con- spicuous feature among living beings. There is no organism, simple or complex in structure and function, that is the exact duplicate of another organism. Nature never produces two individuals that are exactly alike. In a field of wheat, corn, or in a group of any of our cultivated or wild plants, however numerous the plants of the group may be, no individual can be found that does not differ in a number of ways from all othei' individuals of the group. (Figs. 464 and 465.) Plants vary in. Fig. 464. — Heads of Timothy selected from a field of Timothy to show variation in form and size of heads. After Clark. numerous ways. They vary in the shape, color, size and struc- ture of their flowers; in size, color, and structure of fruit; in length, diameter, and structure of stems; in kind, depth, and spread of root systems; in shape, number, structure, and function of leaves; in resistance to disease and drought; and in other ways too numerous to mention. In addition to the numerous variations that are easily recognized, there are variations in cellular struc- 513. 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 Martin, John N. (John Nathan), b. 1875. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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