. 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) 543 In rich, moist soil this weed sometimes attains a height of ten feet, but is more often three to six feet tall,. Stem slender, smooth, often glaucous, sometimes of a purplish tinge but most commonly deep green. Lower and basal leaves lance- shaped in outline but deeply and irregu- larly lobed, the terminal segment large and acutely pointed, the lateral ones un- equal
. 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) 543 In rich, moist soil this weed sometimes attains a height of ten feet, but is more often three to six feet tall,. Stem slender, smooth, often glaucous, sometimes of a purplish tinge but most commonly deep green. Lower and basal leaves lance- shaped in outline but deeply and irregu- larly lobed, the terminal segment large and acutely pointed, the lateral ones un- equal in number and size, not opposite, and frequently with points turned back- ward, narrowing to margined petioles; upper leaves much smaller, often entire and sessile. Heads numerous, in a loosely branching terminal panicle and in short axillary clusters; heads yellow, hardly more than a quarter-inch broad, the in- volucre cylindric, its inner row of bracts linear, the outer ones short and spreading. Achenes oblong-oval, tipped with a slen- der beak; pappus white, very fine and silky. The plant has a strong, unpleasant odor resembling opium, and, though cattle and sheep eat it readily, it will damage dairy products if milch cows get much of it. (Fig. 376.) Means of control the same as for Prickly Fig. 376. —Wild Let- tuce (Lactuca canadensis). Xi. ARROW-LEAVED WILD LETTUCE 4 Lactiica sagittifdlia, Ellis Other English names: Devil's Ironweed, Horseweed. Native. Biennial. Propagates by seeds. Time of bloom: July to September. Seed-time: August to November. Range: New Brunswick and Ontario to Georgia, westward to tne Rocky Mountains. Habitat: Dry, open soil; fields, meadows, 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 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
