. Nature study and agriculture. Nature study; Agriculture. 76 NATURE STUDY AND AGRICULTURE. Red Clover Roots With nodules. of nitrates in the soil is easily ex- hausted, so that it must be replen- ished from time to time. There are several thousand spe- cies of legumes, the most familiar examples being peas, beans, the clovers, alfalfa, sweet clover, prairie clover, the wild vetches, and the milk vetches. The family also in- cludes several trees, as the Siberian pea tree and the locust. The Family of the Composites. — This is the largest family of our common plants and includes many of our mos
. Nature study and agriculture. Nature study; Agriculture. 76 NATURE STUDY AND AGRICULTURE. Red Clover Roots With nodules. of nitrates in the soil is easily ex- hausted, so that it must be replen- ished from time to time. There are several thousand spe- cies of legumes, the most familiar examples being peas, beans, the clovers, alfalfa, sweet clover, prairie clover, the wild vetches, and the milk vetches. The family also in- cludes several trees, as the Siberian pea tree and the locust. The Family of the Composites. — This is the largest family of our common plants and includes many of our most familiar flowers. The term composite refers to the fact that what we regard as a single flower is really composed of a large number of flowers, thus making a sort of compound flower. The cultivated sunflower, on ac- count of its large size, is perhaps the best example for studying the structure of com- posites, but the common thistle, the blaz- ing star, or the wild sunflower will do very well. Let us take the sunflower as our ex- ample. Upon careful examination we find that the " flower " consists of scores of tiny florets massed together in a compact cluster which botanists call a head. On the out- side of this there are several overlapping rows of small, leaf-like scales that resemble a calyx and are called the involucre. Next within this green involucre. 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 Schmidt, Charles Christian, 1859-. Boston, New York [etc. ] D. C. Heath & Co
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