Page author: David Giblin
Myriophyllum sibiricum
American milfoil, northern milfoil, Siberian water milfoil
WTU specimens
Other herbaria

Distribution: Widespread in North America; British Columbia south the California, east to the Atlantic Coast.

Habitat: Ponds and quiet streams, often in brackish water.

Flowers: June - August

Origin: Native

Conservation Status: Not of concern

Description:
General:

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.

Accepted Name:
Myriophyllum sibiricum Kom.

Synonyms & Misapplications:
Myriophyllum exalbescens Fernald [Abrams, Peck]
Myriophyllum spicatum L. var. exalbescens (Fernald) Jeps. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Myriophyllum sibiricum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Myriophyllum sibiricum checklist entry.

E-Flora BC: Myriophyllum sibiricum atlas page.

CalPhotos: Myriophyllum sibiricum photos.

USDA Plants: Myriophyllum sibiricum information.

14 photographs:
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