Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
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Thistle, Marsh<br />
Cirsium palustre, Asteraceae (Sunflower Family)<br />
Category: Prohibited Noxious<br />
• Information: May hybridize with Canada Thistle and native marsh thistles.<br />
• Life Cycle: Biennial, rosette in the first year, flowers in the second.<br />
• Root: Fibrous root system.<br />
• Leaves: Leaves covered with long sticky hairs, lobed, 15-20cm long.<br />
• Stems: 1-1.5m tall, branched at top, thick, reddish in color, covered in<br />
long sticky hairs.<br />
• Flower: Many flowers per plant, purple, bracts spineless.<br />
• Seed/Fruits: Small, hard, elongated, tuft of bristles (pappus) for seed<br />
dispersal.<br />
• Toxicity:<br />
• Control: Control in first year (rosette stage) or before seed set.<br />
48<br />
All: http://dnr.wi.gov/invasives/pdfs/WI%20inv%20plant%20field%20guide%20web%20version.pdf
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