. Common weeds of the Canadian Prairies;. Weeds. Amaranthus retroflexus L. RED-ROOT PIGWEED An erect annual with a reddish root, to 21 feet high, with angular, rough stems somewhat hairy at the tips. Leaves stalked, ovate, rough, 3 to 4 inches long. Flowers in dense spikes in leaf axils and in large terminal spike. Very common along roadsides, in fields and waste Ambrosia artemisiifolia L. var. elatior (L.) Descourtils COMMON RAGWEED An erect annual to 3 feet high, with stalked leaves, much divided and gray-hairy beneath. Male heads numerous, in long, narrow ra- cemes; female heads in
. Common weeds of the Canadian Prairies;. Weeds. Amaranthus retroflexus L. RED-ROOT PIGWEED An erect annual with a reddish root, to 21 feet high, with angular, rough stems somewhat hairy at the tips. Leaves stalked, ovate, rough, 3 to 4 inches long. Flowers in dense spikes in leaf axils and in large terminal spike. Very common along roadsides, in fields and waste Ambrosia artemisiifolia L. var. elatior (L.) Descourtils COMMON RAGWEED An erect annual to 3 feet high, with stalked leaves, much divided and gray-hairy beneath. Male heads numerous, in long, narrow ra- cemes; female heads in small clusters. A weed of waste places and roadsides, common in the eastern portions but scarcer further 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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