. Weeds and weed seeds illustrated and described [microform]. Weeds; Mauvaises herbes; Mauvaises herbes; Weeds. WEEDS AND WEED SEEDS. 27 Common Ragweed (Amhrusia artemisiifulia L.) is the most widely distrib- uted member of this (iroup, ix'ing especially abundant in southwestern Ontario. It is a native annual, a coarse, i)ranehinji plant with hairy 2 to 4 feet hisrh. Leaves thin, smooth above, grayish white beneath from short, downy hairs, much cut up, pinnatifid, twice divided. The flowers closely resemble those of Great Ragweed but are smaller. The seed is from ,V to I of an inch
. Weeds and weed seeds illustrated and described [microform]. Weeds; Mauvaises herbes; Mauvaises herbes; Weeds. WEEDS AND WEED SEEDS. 27 Common Ragweed (Amhrusia artemisiifulia L.) is the most widely distrib- uted member of this (iroup, ix'ing especially abundant in southwestern Ontario. It is a native annual, a coarse, i)ranehinji plant with hairy 2 to 4 feet hisrh. Leaves thin, smooth above, grayish white beneath from short, downy hairs, much cut up, pinnatifid, twice divided. The flowers closely resemble those of Great Ragweed but are smaller. The seed is from ,V to I of an inch long, dull light stniw to dark brown, somewhat pear-shai)ed, the apex long and tapering to a sharp point. The surface is veined and slightly ridged lengthwise. This ridge usually terminates in sharp teeth, which form a circle around and t'A JL PO'n* t"*^^"''"''! the aix'X. These f llffiiH 'â¢^'â¢'th vary in number, size and 0 WW.' regularitv and are sometimes ^ c WR' entirely absent. The outer V V Xy covering of the see<l is brittle and may be more or 1< ;s broken away, thus revealing a smooth, brown, inner cover. The brei'.king off of this second coat shows the inside seed, which is greenish white, nearly round and slightly [lointed at the base. I{agweed is a common impurity in red clover. Eradication.â.\void imi)ure seed. Plow or disc stubble land immediately after harvest or mow to prevent seeding. Short rotation of crops. Perennial Ragweed (Ambronia pailuxlachya DC) resembles common Rag- weed in the shape of the leaves and flowers, but has running rootstocks which throw up weak stems. It occurs on the prairies occasionally. % â ^M rm ^r Ox-eye Daisy {Chrysanlhemum Li'in-aidhd with white; no pappus. Often found in large quanti- in Canadian grown timothy >vvd. Kraiiication. Shallow ploughing followed by cultivation. Short rotation f crops. 71020â."). Please note that these images are extracted from scanned page images that may have been dig
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1914
