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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Heart-shaped, hollowed out on one side or roundly triangularseeds (achenes) of which (Plate 54, fig. 37—natural size and enlarged 8 times)are frequently found among the seeds of grasses and clover, and the Dock-leaved Peesicaet, Polygonum lapathifoliiim, L., a common tall-growingand rather aggressive weed among grain and clover on rich low land in allparts of Eastern Canada. The seeds of the latter, which also occur withthe above, are yV of an inch long, more roundly heart-shaped, chocolatebrown, hollowed on both faces and never triangular. A larger (J inch)blackish seed closely resembling both of the preceding, but more frequently bearing the spike-like base of the pistil at the tip, is that of the IrLANDtrLAR Persicary, Polygonum pennsylvanicum, L. The seeds of this plant, as those of the Ladysthumb, are sometimes triangular. (S) The third group contains plants mostly with twining or climbingstems and with arrow-head-shaped leaves, as the Wild Buckwheat (Plate 43). S2 Plate 43
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WILD BUCKWHEAT OR BLACK BINDWEED (Polygonum Convolvulus./.) PLATE 43.WILD BUCKWHEAT. Polygonum Concolculus, L. Other English name: Black Bindweed. Introduced. Annual. A twining vine with rather rough branchingstems and thin, smooth, arrow-head-shaped leaves. Flowers greenish, drooping, on short slender pedicels, in small clusters from the axils of the leavesand in loosely flowered terminal racemes. Calyx 5-parted, persistent, closely wrapped around the single dull black triangular seed (achene) (Plate .56,fig. 75—natural size and enlarged 4 times), which is about J-inch long,bluntly pointed at the apex, and almost twice as long as broad, widest just above the middle; embryo club-shaped, small, curved and lying along oneangle of the seed in a groove in the large central mealy mass. Time of Flowering: From June throughout the summer, the seeds ripening irregulirly from about the beginning of July. Propagattan: By seed. Occurre-Ace: General. Most injurious in the Prairie Provinces. In

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