. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. 538 COMPOSITAE (COMPOSITE FAMILY) shaped base, all dark green, waxy-smooth, toothed with weak spines. Heads in large corymbose clusters, deep yellow, nearly two inches broad, the long rays five- toothed, the bracts of the involucre and the pedicels usually set with stiff, glandular hairs, though in some locali- ties a smooth and glaucous variety is common. Achene brown, about an eighth of an inch lon
. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. 538 COMPOSITAE (COMPOSITE FAMILY) shaped base, all dark green, waxy-smooth, toothed with weak spines. Heads in large corymbose clusters, deep yellow, nearly two inches broad, the long rays five- toothed, the bracts of the involucre and the pedicels usually set with stiff, glandular hairs, though in some locali- ties a smooth and glaucous variety is common. Achene brown, about an eighth of an inch long, compressed, with wrinkled lengthwise ridges, and tufted with very copious, fine, white pappus. (Fig. 371.) Means of control Short rotations of hoed crops, re- ceiving very -frequent, thorough, and late tillage, are necessary in order to clear the ground of this weed1. It is not harmed by any spray. Horse cul- tivation serves only to break and spread the rootstocks. Complete prevention of food-assimilating green growth above ground is the only sure Fig. 371. — Field Sow Thistle (Sonehus arvensis). X $. COMMON SOW THISTLE S6nchus oleraceus, L. Other English names: Hare's Lettuce, Colewort, Milk Thistle. Introduced. Annual. Propagates by seeds. Time of bloom: June to September. Seed-time: July to October. Range: Throughout North America except the far North. Habitat: Fields, roadsides, waste places. In Europe this plant is used as a pot herb, as its specific name, oleraceus, indicates, and is kept succulent by the constant pinching out of its buds. It springs from a white taproot, well fringed with feeding rootlets, the stem one to six feet tall, angled, branching,. 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 Georgia, Ada Eljiva, 1859-1921. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
