Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
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Montana State University <strong>Invasive</strong> <strong>Plant</strong> <strong>Identification</strong> <strong>Guide</strong><br />
Knapweed, Diffuse<br />
Centaurea diffusa, Asteraceae (Sunflower Family)<br />
Category: Prohibited Noxious<br />
Information: Introduced from Eurasia.<br />
Life cycle: Biennial or short-lived perennial.<br />
Root: Taproot.<br />
Leaves: Seedlings have finely divided leaves with small hairs. Mature<br />
leaves are divided into linear segments, broadly lance-shaped, grayishgreen,<br />
covered with woolly hairs, and alternate.<br />
Stems: Up to 60cm tall and highly branched.<br />
Flower: White or pink flower head. Bracts form stiff, cream- to brown<br />
coloured spines divided into comb-like teeth.<br />
Seed/Fruit: Brown or grayish, small.<br />
Control: Long term, hand pick, chemical.<br />
Montana State University <strong>Invasive</strong> <strong>Plant</strong> <strong>Identification</strong> <strong>Guide</strong><br />
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Montana State University <strong>Invasive</strong> <strong>Plant</strong> <strong>Identification</strong> <strong>Guide</strong>
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