Farm weeds of Canada . ved stable, for plants grown from seeds of the variety can hardlyhe distinguished from the ordinary prickly form. In addition to the Canada Thistle, two other species are sometimes com-plained of by farmers. The Peaikte Thistle or Westeen Bull Thistle,Cnicus undulatus. Gray, is a native perennial with running rootstocks andlarge white-woolly leaves and stems; flower heads large, nearly 2 inchesacross, solitary at the end of the branches. This is not a very serious pestand soon disappears when the land is put under crop. The Bull Thistle or Speae Thistle, Cnicus lanceolat
Farm weeds of Canada . ved stable, for plants grown from seeds of the variety can hardlyhe distinguished from the ordinary prickly form. In addition to the Canada Thistle, two other species are sometimes com-plained of by farmers. The Peaikte Thistle or Westeen Bull Thistle,Cnicus undulatus. Gray, is a native perennial with running rootstocks andlarge white-woolly leaves and stems; flower heads large, nearly 2 inchesacross, solitary at the end of the branches. This is not a very serious pestand soon disappears when the land is put under crop. The Bull Thistle or Speae Thistle, Cnicus lanceolatus, is alarge coarse biennial, introduced from Europe, 2 to 4 feet high, widelybranching, with many large deep-purple flower heads li inches high by asmuch across. This plant is very abundant in many parts of Canada, andparticularly so in the partially cleared districts in British Columbia. Asland is cleared and worked regularly, this weed, each plant of which livesonly for two years, is killed out. 60 Plate 30. CHICORY (Cichonum Inhybus /,) PLATE 30. CHICORY, Cichorium Inty^bus, L. Other English names : Wild Chicory, Wild Succory. (Xoxious: Dom.) Introduced. Perennial from a long deep rootstock. Stems 2 to 3 feethigh, branched, hairy below. Eoot leaves, closely resembling those of theDandelion, 6 to 8 inches, spreading on the ground, runcinate pinnatifid ordentate; midribs hairy beneath; upper leaves glandular ciliate on the mar-gins, clasping at base. Flower heads bright blue, nearly 2 inches across,composed entirely of strap-shaped flowers, usually closing by noon, in sessileclusters of three or four together along the almost leafless stems. Seeds[Plate 54, fig. 21—natural size and enlarged 8 times] | inch long, darkbrown or straw-coloured, mottled with brown, wedge-shaped, obtusely .3 to5-angled, some seeds being much curved; the surface is grooved and ridgedfrom top to bottom and roughened crosswise with minute close raised andwaved lines; at the top, surrounding
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
