. 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. CRUCIFERAE (MUSTARD FAMILY) 193 Kansas, northwestward to Washington; all the Canadian prov- inces from Quebec to Vancouver Island. Habitat: Grain fields and grasslands, waste places. A native of Central Europe brought to this country in impure commercial seeds ; by this agency it still travels, and no doubt jour- neys farther in this way than when wind-driven about the country. Stem two to four feet
. 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. CRUCIFERAE (MUSTARD FAMILY) 193 Kansas, northwestward to Washington; all the Canadian prov- inces from Quebec to Vancouver Island. Habitat: Grain fields and grasslands, waste places. A native of Central Europe brought to this country in impure commercial seeds ; by this agency it still travels, and no doubt jour- neys farther in this way than when wind-driven about the country. Stem two to four feet high, slender, smooth, and exceedingly branched and bushy. Leaves deeply pinnatifid, the segments nearly linear, toothed or entire, the upper ones reduced to thread-like thinness ; when the plant is young the lower leaves are downy and the basal ones lie on the ground in rosette form, but these wither away and the later leaves are smooth. Flowers pale yellow, about a third of an inch across, on elongating ra- cemes that leave behind alter- nating rows of stiff, diverging, needle-like pods, two to four inches long but hardly thicker than their short pedicels. Each pod usually contains more than a hundred seeds—the fecundity of the weed is almost incredible. When mature the stems become very brittle, breaking away at the surface of the ground, and the plants are afterward the sport of the winds; on the prairies they often roll for miles, but in fenced and uneven ground they are battered to and fro, seeding the soil the more thickly for such restriction. (Fig. 136.). Fig. 136. — Tumbling Mustard (Sisym- brium altissimum). x \- Means of control Sow clean seed. Harrow seedlings out of grain fields in the spring. Harvest infested meadows before the first seeds ripen. Burn over. 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
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Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
