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 />
Eurasian Water Milfoil<br />
Myriophyllum spicatum , Haloragaceae (Water Milfoil Family)<br />
Category: Prohibited Noxious<br />
Montana State University <strong>Invasive</strong> <strong>Plant</strong> <strong>Identification</strong> <strong>Guide</strong><br />
• Life cycle: Aquatic perennial.<br />
• Root: Numerous at base and along stem.<br />
• Leaves: Three to four bright-green leaves, 3cm long with 12 to 48 threadlike<br />
divisions are whorled around stem at each joint. Leaves<br />
rarely extend above water surface and mat when removed from water.<br />
• Stems: Slender, hairless, leafless toward base, 3m long or longer and<br />
2mm thick. Grow to water surface then branch forming dense floating mats.<br />
Somewhat whitened when dry.<br />
• Flower: Rigid, pink flowering spike, 5 to 20cm long, held erect above water<br />
surface. Small, yellow, four petaled flowers arranged in clusters.<br />
• Seed/Fruit: Hard, segmented capsule contains four seeds.<br />
20<br />
Montana State University <strong>Invasive</strong> <strong>Plant</strong> <strong>Identification</strong> <strong>Guide</strong>
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