Sinopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...at the starting point varies from 0.2 to 1 mm. Throughout the surface soil they are branched and rebranched to the third and fourth orders, and each group of branches varies from 1 mm. to 3 inches in length. Below 6 inches these main roots, after starting downward, taper until they are not more than 0.2 mm. in diameter. They are more or less branched, the branches being almost hairlike in diameter and 3 to 10 mm. long. In color, the roots vary from a very light brown to a pure white. They are extremely brittle and easily broken. Five plants were examined (fig. 19). Asclepias verticillata pumila.--This dwarf milkweed is generally distributed throughout the hard lands of the plains. It forms extensive midsummer clans. The stems vary from 3 to 5 inches in height and are connected by an extensive underground system which varies in diameter from 1 to 2 mm. These connecting stems extend from 2 to 5 inches in depth and range in distance between the plants from 1 to 15 inches or more. At the points from which the aboveground stems take their origin, one or two roots were found which penetrated the soil, usually vertically but occasionally obliquely downward, following a tortuous course. These vertical roots at the outset may range from 0.5 to 2 mm. in diameter and gradually taper downward to their extremity, which is more or less branched and hairlike. The maximum penetration found was 46 inches. All parts of the root system, beginning about 2 inches below the soil and extending to a depth of about 10 inches, are thickly supplied with small laterals, usually about 0.3 mm. in diameter and from 0.5 to 3 inches in length. These small laterals often come off in groups of 2 or 3. They are themselves branched, ending in very minute capillary termini, thus affording a ver...
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Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...at the starting point varies from 0.2 to 1 mm. Throughout the surface soil they are branched and rebranched to the third and fourth orders, and each group of branches varies from 1 mm. to 3 inches in length. Below 6 inches these main roots, after starting downward, taper until they are not more than 0.2 mm. in diameter. They are more or less branched, the branches being almost hairlike in diameter and 3 to 10 mm. long. In color, the roots vary from a very light brown to a pure white. They are extremely brittle and easily broken. Five plants were examined (fig. 19). Asclepias verticillata pumila.--This dwarf milkweed is generally distributed throughout the hard lands of the plains. It forms extensive midsummer clans. The stems vary from 3 to 5 inches in height and are connected by an extensive underground system which varies in diameter from 1 to 2 mm. These connecting stems extend from 2 to 5 inches in depth and range in distance between the plants from 1 to 15 inches or more. At the points from which the aboveground stems take their origin, one or two roots were found which penetrated the soil, usually vertically but occasionally obliquely downward, following a tortuous course. These vertical roots at the outset may range from 0.5 to 2 mm. in diameter and gradually taper downward to their extremity, which is more or less branched and hairlike. The maximum penetration found was 46 inches. All parts of the root system, beginning about 2 inches below the soil and extending to a depth of about 10 inches, are thickly supplied with small laterals, usually about 0.3 mm. in diameter and from 0.5 to 3 inches in length. These small laterals often come off in groups of 2 or 3. They are themselves branched, ending in very minute capillary termini, thus affording a ver...
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