Farm weeds of Canada . eart-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
Farm weeds of Canada . eart-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 ;ely resembling both of the preceding, but more fre-quently bearing the spike-like base of the pistil at the tip, is that of theIrLANDtrLAR Persicary, Polygonum pennsylvanicum, L. The seeds ofthis plant, as those of the Ladys-thumb, 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. WILD BUCKWHEAT OR BLACK BINDWEED(Polygonum ) PLATE 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, droop-ing, on short slender pedicels, in small clusters from the axils of the leavesand in loosely flowered terminal racemes. Calyx 5-parted, persistent, close-ly 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 justabove 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 ri-pening irregulirly from about the beginning of July. Propagattan: By seed. Occurre-Ace: General. Most injurious in th
Size: 1330px × 1878px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
