. Farm weeds of Canada . ndant inmeadows in the Maritime Provinces. This is the Knapweed, Centavreanigra, L., a rather coarse perennial with thistle-like flowers, over one inchacross and H inches high. The involucre or calyx-like whorl of bracts sur-rounding the flower-heads is spherical and composed of black-fringed seeds are about J of an inch long by about half as wide, taper-ing to the base, cut off squarely above. On one side of the base, but abovethe end, is the large conspicuous basal scar; ihe lar^c apical scar covers thewhole of the top of the seed, and is surrounded by the
. Farm weeds of Canada . ndant inmeadows in the Maritime Provinces. This is the Knapweed, Centavreanigra, L., a rather coarse perennial with thistle-like flowers, over one inchacross and H inches high. The involucre or calyx-like whorl of bracts sur-rounding the flower-heads is spherical and composed of black-fringed seeds are about J of an inch long by about half as wide, taper-ing to the base, cut off squarely above. On one side of the base, but abovethe end, is the large conspicuous basal scar; ihe lar^c apical scar covers thewhole of the top of the seed, and is surrounded by the pappus of two orthree rows of short, flat bristles. The seeds (achenes) [Plate r)(i. ficr. 6-3—natural size and enlarged 4 times] are slightly angular, somewhat flattenedand striped lengthwise on their shining gray surface with pale ridges; thewhole seed is sparsely hairy. The Knapweed is palatable to all stock andin no way injurious, but is unsightly and takes the place of ihe more valu-able true grasses. 48 Plate 21. NARROW-LEAVED GOLDENROD(Solidago lanceola^ ) PLATE 21. NARROW-LEAVED GOLDENROD, Solidago lanceolala. L. Other English names : Bushy or Fragrant Goldenrod, Yellow-weed. Other Latin names: Euthamia graminifolia (L.) Xutt.; Chrysocomagraininifolia, L. Native. Perennial. Stems erect, cymosely branched above, 2 to 3 feethigh, almost smooth. Leaves numerous, linear-lanceolate, 1 to 5 inches long,the edges rough-pubescent. Separate heads of flowers about one-quarter ofan inch across, bright golden yellow in dense, flat-topped clusters. Seeds(achenes) ovate-oblong, small, -^ of an inch, downy. Pappus white. Time of Flowering : July to September; seeds ripe in September. Propagation: By seeds blown by the wind, and by long running root-stocks forming new plants at the tips, and, if left undisturbed, soon forminglarge patches. Occurrence: In low land, throughout the Dominion. Injury: Much complained of as a weed in damp hay meadows in theEastern Provinces. The seeds
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
