Page author: David Giblin
Myriophyllum quitense
Andean water milfoil, waterwort water milfoil
WTU specimens
Other herbaria

Distribution: Occurring in scattered locations in Washington; British Columbia south to California, east across Canada to New Brunswick, east in the U.S. to Idaho, Wyoming, and Utah; occurring in Mexico and South America.

Habitat: Ponds and slow-moving streams.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

Perennial, aquatic herbs, the stems simple or branched, 2-10 dm. long.

Leaves:

Leaves 1-2.5 cm. long, in whorls of 4-5, dissected into 13-21 filiform segments, appearing comb-like, gradually transitional to the bracts; bracts ovate-oblong, 7-10 mm. long, the lower comb-like, transitional to serrulate in the upper bracts.

Flowers:

Inflorescence simple to forked, submerged to emergent; flowers single, subtended by whitish, rough-edged bracteoles 1-2 mm. long; sepals 4, attached to the top of the inferior ovary, whitish, serrate; petals 4, about 2.5 mm. long, quickly deciduous; stamens 8 on the staminate flowers; stigmas plumose on the pistillate flowers.

Fruits:

Achene smooth, 2 mm. long.

Accepted Name:
Myriophyllum quitense Kunth

Synonyms & Misapplications:
Myriophyllum elatinoides Gaudich. [HC]
Additional Resources:

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

WA Flora Checklist: Myriophyllum quitense checklist entry.

E-Flora BC: Myriophyllum quitense atlas page.

CalPhotos: Myriophyllum quitense photos.

USDA Plants: Myriophyllum quitense information.

3 photographs:
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