. 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. 540 COMPOSITAE (COMPOSITE FAMILY) trate the skin. Stems one to six feet high, smooth, angled, branching, full of milky sap. Lower leaves sometimes pinnatifid but usually undivided and spatulate, tapering to margined petioles; stem-leaves oblong or lance-shaped, clasping the stem with rounded auri- cles, the margins prickly-toothed, the surfaces dark green, smooth, and shin- ingw Heads similar to thos
. 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. 540 COMPOSITAE (COMPOSITE FAMILY) trate the skin. Stems one to six feet high, smooth, angled, branching, full of milky sap. Lower leaves sometimes pinnatifid but usually undivided and spatulate, tapering to margined petioles; stem-leaves oblong or lance-shaped, clasping the stem with rounded auri- cles, the margins prickly-toothed, the surfaces dark green, smooth, and shin- ingw Heads similar to those of the Common Sow Thistle. Achenes oblong, compressed, margined, with smooth ribs. (Fig. 373.) Means of control the same as for Common Sow Thistle. PRICKLY LETTUCE Lactuca scarlola, L. Var. integrate,, Gren. & Godr. Other English names: Compass Plant, Milk Thistle, English Thistle. Introduced. Annual and winter annual. Propagates by seeds. Time of bloom: July to October. Seed-time: August to November. Range: Massachusetts to Georgia and Tennessee, westward to the Missouri River; also in Idaho, Oregon, and Washington. Most abundant in the Ohio Valley and in the states bordering on the Great Lakes. Habitat: All soils; invades all crops. A noxious weed that owes its wide range almost entirely to the agency of impure seed. It first appeared in Massachusetts not many years ago, and has since journeyed from ocean to ocean and could probably be found now in every state in the Union. In addition to its robbery of the crop in grain fields, thehardstems dull the reaping knives, and the copious, milky juice makes the weed very troublesome in threshing machines when handling a crop im- mediately after the reaping, without drying in the shock, as is frequently done in the Fig. 373. — Spiny-leaved Sow Thistle (Sonchus asper). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
