. 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. 120 CHMNOPODIACEAE (GOOSEFOOT FAMILY) clustered in the axils; these each produce a single ovoid, flattened seed, about a tenth of an inch long, minutely ridged lengthwise, gray and shining; many seeds have the utricle or papery covering persistently enfolding them and projecting from the top as a two-lobed wing. When mature, the stems, bracts, and calyx lobes turn white, and the plants are then very
. 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. 120 CHMNOPODIACEAE (GOOSEFOOT FAMILY) clustered in the axils; these each produce a single ovoid, flattened seed, about a tenth of an inch long, minutely ridged lengthwise, gray and shining; many seeds have the utricle or papery covering persistently enfolding them and projecting from the top as a two-lobed wing. When mature, the stems, bracts, and calyx lobes turn white, and the plants are then very con- spicuous. They frequently become tumble- weeds, the woody, brittle stems breaking at the base and the whole weed rolling away before the wind, sowing seed as it goes; by this means its range is being very rapidly extended. Means of control In grain fields, large numbers of the young seedlings may be dragged out with a weeding harrow, in the spring, when the crop is but a few inches high; plants that survive this treatment should be hand-pulled later, but before their rank growth injures the crop by absorbing its food and moisture. Meadows infested by the weed should be early cut in order to prevent fouling the soil with the seed. Plants along roadsides and railways and in waste places should be cut while in early flower, and burned so as to make certain that no seed shall Fig. 73. — Russian Pigweed (Axyris ama- ranUMes). X \. ROUGH PIGWEED Amardnthus retroJUxus, L. Other English names: Redroot Pigweed, Chinaman's Greens. Introduced. Annual. Propagates by seeds. Time of bloom: July to September. Seed-time: August to November. Range: Throughout North America except the far North. Native of tropical America and indigenous in the Southwest. Habitat: Cultivated ground; waste 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 perf
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
