Myriophyllum spicatum |
Myriophyllum farwellii |
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Eurasian water milfoil, spiked water milfoil |
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Habit | Perennial, aquatic herbs, the stems simple or branched. | |
Leaves | Leaves 1-3 cm. long, in whorls of 3-4, pinnately dissected into 13-23 filiform segments, abruptly reduced to the bract-like leaves of inflorescences. |
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Flowers | Inflorescence emergent, simple; flowers single, subtended by bracts no longer than the fruit, the bracts serrulate to entire; sepals 4, attached to the top of the inferior ovary; petals 4, 2.5 mm. long, quickly deciduous; stamens 8 on the staminate flowers; stigmas short-hairy on the pistillate flowers. |
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Fruits | Achene 2.5 mm. long, rounded. |
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Myriophyllum spicatum |
Myriophyllum farwellii |
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Flowering time | April-October | |
Habitat | Ponds, lakes, and quiet streams. | |
Distribution | Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
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Origin | Introduced from Eurasia | |
Conservation status | Not of concern | |
Sibling taxa | ||
Web links |
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