File:Farm weeds of Canada (1906) (14796102803).jpg

Identifier: farmweedsofcana00clar (find matches)
Title: Farm weeds of Canada
Year: 1906 (1900s)
Authors: Clark, George Harold, 1872- Fletcher, James, 1852-1908 Criddle, Norman Canada. Dept. of Agriculture
Subjects: Weeds Weeds Botany
Publisher: Ottawa : Published by direction of the Minister of Agriculture
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: Ontario Council of University Libraries and Member Libraries

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flowers. The seeds are long and narrow, spindle-shaped, the upper end blunt and slightly enlarged by the white apical scar;surface finely ridged lengthwise, and covered with short white bristles, inthis way differing from the seeds of the similar Stinking Groundsel, Senecioviscosus, L., which occurs in the Maritime Provinces with the CommonGroundsel, and, although the whole plant is viscid pubescent, has its ratherlonger seeds entirely without bristles; its flower-heads also bear distinctmarginal ray-florets. The Common T.^nst. Tanacetum vulgare, L., is quite a different plantfrom the Common Ragwort, although there seems to be much confusion inthe Maritime Provinces as to the identity of the two plants. Tansy hasalmost rayless flowers, quite smooth 5-ribbed seeds with five blunt teethat the top instead of a silkv pappus. The plant, too, is pleasantly aromaticinstead of rankly fetid, a character which in Nova Scotia has gained for theCommon Ragwort the name of Stinking Willie. Plate 29
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CANADA THISTLE(Cnicus arvensis.z/w/m » PLATE 29.CANADA THISTLE, Cnicus anensis. Hoflm. Other English names: Creeping Thistle, Soft Iield Thistle. Other Latin names : Carduus arvensis (L.) Robs.; Cirsium arvense, Scop. (.Xoxious: Dom., Ont., Man., N.W., B.C.) Introduced. Perennial with very deep running rootstocks. Stems erect,2 to 4 feet high, striate. Leaves very variable in shape, deeply pinnatifid,waved and crested, very prickly, in some plants much less so than in others,somewhat downy, particularly beneath the leaves. Flower heads very numer-ous, in a large loose corymb at the top of the stems, dioecious, some plantsbearing male flowers onlj, which form no seeds, others female flowers only,which produce many seeds; the flower heads of male plants are nearly globu-lar, 1 inch across, those of the female plants oblong, with short florets andonly about half as large; large patches may be found bearing only male orfemale flowers, showing that each originated from a single seed. Flow

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