. Common weeds of the Canadian Prairies;. Weeds. An introduced biennial 1 to 3 feet high. Leaves pinnately divided into narrow lobes, excepting those of the inflorescence, which are smaller and entire. Flower heads purplish or occasionally white, on long stems. Bracts of involucre tipped with a short, dark fringe, not stiff and spiny. A common weed of south- central British Columbia, may be expected eastwards. Centaurea repens L. RUSSIAN KNAPWEED. An erect perennial with coarse, woody, run- ning roots, to 3 feet high. Stems ridged and grooved, covered with white woolly hairs when young. Foliag
. Common weeds of the Canadian Prairies;. Weeds. An introduced biennial 1 to 3 feet high. Leaves pinnately divided into narrow lobes, excepting those of the inflorescence, which are smaller and entire. Flower heads purplish or occasionally white, on long stems. Bracts of involucre tipped with a short, dark fringe, not stiff and spiny. A common weed of south- central British Columbia, may be expected eastwards. Centaurea repens L. RUSSIAN KNAPWEED. An erect perennial with coarse, woody, run- ning roots, to 3 feet high. Stems ridged and grooved, covered with white woolly hairs when young. Foliage extremely unpleasant to the taste. Flowering heads numerous, in terminal panicles, pale yellowish or cream-colored, about f inch long. Flower head bracts with spiny margins and a terminal spine. An extremely persistent, introduced weed, found in fields, shelterbelts, and waste places at various Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Canada. Dept. of Agriculture. Research Branch. Ottawa, Queen's Printer
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