. 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. COMPOSITAE (.COMPOSITE FAMILY) 539 smooth, green, hollow between nodes, filled with milky juice. Leaves lyrate-pinnatifid, the terminal lobe large and triangular, the others narrow and decreasing in size toward the base; the lower and basal leaves petioled, but those on the stem clasping with an auricled and pointed base; the margins toothed with small, weak spines. Heads in crowded cymose panicles,
. 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. COMPOSITAE (.COMPOSITE FAMILY) 539 smooth, green, hollow between nodes, filled with milky juice. Leaves lyrate-pinnatifid, the terminal lobe large and triangular, the others narrow and decreasing in size toward the base; the lower and basal leaves petioled, but those on the stem clasping with an auricled and pointed base; the margins toothed with small, weak spines. Heads in crowded cymose panicles, yellow, nearly an inch broad; the involucres are downy while they enclose the buds, but later become smooth. Achenes brown, slightly flat- tened, with roughened ribs and thickly tufted, white, silken pappus. (Fig. 372.) Means of control Prevent seed development. In gar- dens and other small areas, hand-pull before the first flowers mature. Stub- bles should have surface cultivation after harvest for the purpose of stirring into life such seeds as are on the ground, the seedlings to be turned under at fall plowing. Waste places and roadsides are too often permitted to mature seeds, to the damage of adjacent Fig. 372. — Common Sow Thistle (Sonchus oleraceus). Xj. SPINY-LEAVED SOW THISTLE Sdnchus dsper, Hill Introduced. Annual. Propagates by seeds. Time of bloom: May to October. Seed-time: June to November. Range: All cultivated parts of the world. Habitat: Fields, roadsides, waste places. More prickly than the preceding species; the spines, though weak compared with those of true thistles, can make themselves felt when touched, while those of the Hare's Lettuce are too soft to pene-. 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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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
