UW Burke Herbarium species comparison

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Myriophyllum spicatum

Myriophyllum laxum

Eurasian water milfoil, spiked water milfoil
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.

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.

Fruits

Achene 2.5 mm. long, rounded.

Myriophyllum spicatum

Myriophyllum laxum
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.
[WildflowerSearch map]
[BONAP county map]
[BONAP county map]
Origin Introduced from Eurasia
Conservation status Not of concern
Sibling taxa
M. aquaticum, M. heterophyllum, M. hippuroides, M. pinnatum, M. quitense, M. sibiricum, M. spicatum × M. sibiricum, M. ussuriense, M. verticillatum
M. aquaticum, M. heterophyllum, M. hippuroides, M. pinnatum, M. quitense, M. sibiricum, M. spicatum, M. spicatum × M. sibiricum, M. ussuriense, M. verticillatum
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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