. Common weeds of the Canadian Prairies;. Weeds. Erucastrum gallicum (Willd.) O. E. Schulz DOG MUSTARD An erect annual 8 to 18 inches high, with downward-pointing stem hairs. Leaves alter- nate, varying to 10 inches long, deeply cut, often to midvein, making them appear pinnate. Flowers pale-yellow. Seed pods linear, circular in cross section, 1 to H inches long, with short stalks and a slender style. An introduced weed becoming Erysimum asperum (Nutt.) DC. WESTERN WALLFLOWER A rough, usually straggling, biennial 1 to 3 feet high, coarse, much branched, with op- pressed small white
. Common weeds of the Canadian Prairies;. Weeds. Erucastrum gallicum (Willd.) O. E. Schulz DOG MUSTARD An erect annual 8 to 18 inches high, with downward-pointing stem hairs. Leaves alter- nate, varying to 10 inches long, deeply cut, often to midvein, making them appear pinnate. Flowers pale-yellow. Seed pods linear, circular in cross section, 1 to H inches long, with short stalks and a slender style. An introduced weed becoming Erysimum asperum (Nutt.) DC. WESTERN WALLFLOWER A rough, usually straggling, biennial 1 to 3 feet high, coarse, much branched, with op- pressed small white hairs. Flowers pale-yellow, i inch across. Pods IJ to 4 inches long, spread- ing in all directions from the stem, narrow, rough, 4-angled, with a thick style at the end and a short, stout stalk. Common in the south on light and sandy soils, rare to the 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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