. Lehrbuch der pastoralen und landwirtschaftliche Botanik, für die Untersuchung der schädlichen und nützlichen Pflanzen von Land und Hof. Bull. 70 Experimenl Station, Iowa State College, 1903, S. 337.) Ox-eye Daisy {Chrysantheme Icucanthemum Thestems pinnatifidnm).- Der weiße Daisy sind von eins bis drei Fuß hoch mit einem headof Blüten mit weißen Rn und gelben Scheibenblüten getuftet. Die rootleaves sind in einer Rosette und Spatelförmig, pinnatifid. Die achenes, Whichare gefunden als Verunreinigung in fast allen Grassamen, sind grau-schwarz andfinely Gerippte ohne Pep]) ers. Sauberes Saatgut 17-32> - sollte gesät werden. T

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. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. Bull. 70 Experimenl Station, Iowa State College, 1903, p. 337.) Ox-eye Daisy {Chrysanthemum Icucanthemum pinnatifidnm).—Thestems of white daisy are tufted from one to three feet high bearing a headof flowers with white marginal ones and yellow disc florets. The rootleaves are in a rosette and are spatulate, pinnatifid. The achenes, whichare found as an impurity in nearly all grass seeds, are grayish-black andfinely ribbed without pep])ers. Clean seed onl>- should be sowed. Thedaisy field can ])e cleansed by short rotations, as the perennial roots are 252 PASTORAL AND AGRICULTURAL BOTANY turned out and killed by the plow. Mowing infested fields before theheads develop is another useful means of extermination (Figs. io6 and 107). Canada Thistle {Cirsium arvense).—Nearly all of the states have lawswhich make it an offense for their citizens to permit this weed to matureand scatter its seeds. It is a perennial propagated by seeds and rootstocks.The map shows its range (Fig. 108).. Fig. 108.—Map of the United States, showing the present distribution of theCanada thistle. The heavy line indicates the approximate southern boundary^of theweed; the shaded area shows where the plant is most injurious. (After Hansen, AlbertA.: Canada Thistle and Methods of Eradication. Farmers Bulletin 1002, 1918, p. 5.) Classification of Weeds Weeds are conveniently classified according to the duration of theirunderground parts into: 1. Annual weeds, or those which complete their growth and maturetheir seeds in one year. Such plants are easily destroyed by cultivation.Here belong ragweed, crabgrass, purslane, pigweed and Russian thistle. 2. Winter annuals. These plants drop their seeds in the fall whichgerminale and give rise to plants which hold through the winter, finallyproducing flowers and seeds in the spring. Such are the chickweed andshepherds i)urse. Here also

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• book
• bookcentury1900
• bookdecade1920
• booksubjectpoisonousplants