. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. POLYOONAOEAE {BUCKWHEAT FAMILY) 97 PROSTRATE KNOTWEED Polygonum aviculare, L. Other English names: Doorweed, Knotgrass, Matgrass. Native. Annual or perennial. Propagates by seeds. Time of bloom: June to October. Seed-time: July to November. Range: Nearly everywhere in North America, Europe, and Asia Habitat: Cultivated grounds, yards, roadsides, and waste places. A social, almost domesticated, weed,
. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. POLYOONAOEAE {BUCKWHEAT FAMILY) 97 PROSTRATE KNOTWEED Polygonum aviculare, L. Other English names: Doorweed, Knotgrass, Matgrass. Native. Annual or perennial. Propagates by seeds. Time of bloom: June to October. Seed-time: July to November. Range: Nearly everywhere in North America, Europe, and Asia Habitat: Cultivated grounds, yards, roadsides, and waste places. A social, almost domesticated, weed, seeming to thrive best where most trampled and abused, growing in thick mats along hard-beaten farmyard paths, and in- truding persistently in lawns and garden bor- ders; it often fringes the stone flags of city sidewalks. Stems slender, pale green, faintly ridged, usually prostrate, four inches to nearly two feet in length, branching in all directions from the white, woody, rather deeply boring root. Smaller branches come out at many of the numberless "knots," or joints, which are pale under the sheathing stipules. Leaves bluish green, nearly elliptical in shape, sessile or with very short petioles, a quarter-inch to an inch long. Flowers very small, the calyx five-parted, greenish white with pink margins, sitting solitary or in groups of two or three in the leaf axils; stamens usually eight, sometimes fewer; style three-parted. Achenes dull brown, with acute apex and rounded base, three-angled, and minutely ridged. This species and also the one following is often attacked by a white mil- dew. (Fig. 57.). Fig. 57. — Pros- trate Knotweed (Polygonum avicu- lare). Xi. Means of control Hoe-cutting or hand-pulling before the first seeds ripen. Dor- mant seeds will supply later crops to be treated in the same way until the ground is Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
