. Common weeds of the Canadian Prairies;. Weeds. Sonchus arvensis L. PERENNIAL SOW-THISTLE A perennial 1 to 5 feet high, with strongly creeping rootstocks. Stems usually hollow, not much branched. Lower leaves 4 to 10 inches long, narrowed to a short stalk and having backward-pointing lobes, upper without stalks and less lobed. Leaf teeth spine-tipped. Flowers bright yellow, in a corymbose panicle on bristly stalks. Common in moister areas of Sonchus asper (L.) Hill PRICKLY SOW-THISTLE An annual 2 to 6 feet high. Leaves slightly lobed, clasping stem at base; lobes spine-tipped, basa
. Common weeds of the Canadian Prairies;. Weeds. Sonchus arvensis L. PERENNIAL SOW-THISTLE A perennial 1 to 5 feet high, with strongly creeping rootstocks. Stems usually hollow, not much branched. Lower leaves 4 to 10 inches long, narrowed to a short stalk and having backward-pointing lobes, upper without stalks and less lobed. Leaf teeth spine-tipped. Flowers bright yellow, in a corymbose panicle on bristly stalks. Common in moister areas of Sonchus asper (L.) Hill PRICKLY SOW-THISTLE An annual 2 to 6 feet high. Leaves slightly lobed, clasping stem at base; lobes spine-tipped, basal lobes rounded. Flowers i to 1 inch across, pale-yellow. Common in gardens and roadsides across 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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