. Weeds and weed seeds illustrated and described [microform]. Weeds; Mauvaises herbes; Mauvaises herbes; Weeds. WEEDS AND WEED SEEDS. 49 \., Common Evening Primrose (Oenothera biennis L.) is a tall, coarse bien- nial which occurs throughout the country and is easily recognized by its tall branching habit (4 ft. by 3 ft.), its soft, downy, lance-" shaped leayes, and its large showy, yellow flowers which open in the evening. This species makes only a rosette of leaves the first year. For this reason it appears only in crops sown in autumn or on stubble. In thin clover fields it .sometimes o
. Weeds and weed seeds illustrated and described [microform]. Weeds; Mauvaises herbes; Mauvaises herbes; Weeds. WEEDS AND WEED SEEDS. 49 \., Common Evening Primrose (Oenothera biennis L.) is a tall, coarse bien- nial which occurs throughout the country and is easily recognized by its tall branching habit (4 ft. by 3 ft.), its soft, downy, lance-" shaped leayes, and its large showy, yellow flowers which open in the evening. This species makes only a rosette of leaves the first year. For this reason it appears only in crops sown in autumn or on stubble. In thin clover fields it .sometimes occurs conspicuously and should be either spudded out or cut off below the crown in the first season; or the tall flowering plants should be cut off below the surface and pulled out before the seeds ripen. The seeils are produced in large numbers in long, tapering, 4-celled capsules, 2 rows of seed in each cell, which are clustered all along the stems. They are about ,Lj of an inch long, dark reddish-brown, and with a rough- H ^H f ened surface much angled by com- pression in the pods. They are a very common impurity in clover and grass .seed, being especially abimdant in timothy. .\s the pods do not easily shed their seeds and the plants are at all times conspicuous, much contamination of .-ieed crops may be prevented by a little care at harvest time. Eradication. -Prevent seeding. V. White Evening Primrose ((knothra pallida ) is a native perennial occurring in Manitoba and westward to IJritish Columbia. It is deep-rooted and very persistent in sandy land. The roots are white and fleshy, wide-spreading and throw- ing up flowering stems at intervals, thus forming large patches. Stems mostly simple, shining white, sparsely downy above, erect or nearly so, about A feet high. Leaves from I to 4 inches long, narrow and waved, .sometimes pinnatifid but usually without teeth or divisions in plants found in the West. Mowers , large and handsome, IJ inches across, waxy-w
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1914
