Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
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Thistle, Plumeless<br />
Carduus acanthoides, Asteraceae (Sunflower Family)<br />
Category: Prohibited Noxious<br />
• Information: May also be called Bristly Thistle, may also be confused<br />
with native thistles.<br />
• Life Cycle: Herbaceous biennial, or winter annual. Rosette leaves in the<br />
first years growth, flowers in the second.<br />
• Root: Taproot, large and fleshy.<br />
• Leaves: Clasping, alternately arranged on the stem, spines along edge<br />
and at leaf tip, hairy, lobed. Rosette leaves are very large.<br />
• Stems: Spines along stem, up to 2m tall.<br />
Sarah Schumacher, Wheatland County<br />
• Flower: Purple, small, erect, spine tipped bracts, smaller than nodding<br />
thistle.<br />
• Seed/Fruits: Spread by seed, pappus attached to seed, wind dispersal.<br />
• Control: Hand pull, chemical control before seed set.<br />
Sarah Schumacher, Wheatland County<br />
50<br />
Sarah Schumacher, Wheatland County Sarah Schumacher, Wheatland County
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