Blooms: July - September
Habit: herb
Duration: perennial
Origin: Introduced from eastern North America
Distribution: Native from Quebec to Texas and Florida; introduced in Dry Falls Coulee, Grant County, and several lakes west of the Cascades in Washington; also in Oregon and Idaho
Habitat: Ponds, lakes and quiet streams
Habit: herb
Duration: perennial
Origin: Introduced from eastern North America
Distribution: Native from Quebec to Texas and Florida; introduced in Dry Falls Coulee, Grant County, and several lakes west of the Cascades in Washington; also in Oregon and Idaho
Habitat: Ponds, lakes and quiet streams
Species Description:
General: Submersed, dioecious, scapose perennials from rhizomes.
Leaves: Leaves tufted, long, linear and submersed, thin, flat, 1-5 dm. long and 3-10 mm. broad.
Flowers: Staminate flowers tiny, several hundred clustered in a sub-globose structure of 3 fused bracts, becoming deciduous and free-floating; pistillate flowers at the water surfaced, solitary on long, slender scapes, enclosed at the base in fused, tubular bracts on a peduncle 1-2 m. long, tending to coil; sepals 3, 2-3 cm. long; corolla white, 3-parted, 5 mm. wide; stigmas 3, 2-lobed.
Fruits: Fruit 5-10 cm. long.
General: Submersed, dioecious, scapose perennials from rhizomes.
Leaves: Leaves tufted, long, linear and submersed, thin, flat, 1-5 dm. long and 3-10 mm. broad.
Flowers: Staminate flowers tiny, several hundred clustered in a sub-globose structure of 3 fused bracts, becoming deciduous and free-floating; pistillate flowers at the water surfaced, solitary on long, slender scapes, enclosed at the base in fused, tubular bracts on a peduncle 1-2 m. long, tending to coil; sepals 3, 2-3 cm. long; corolla white, 3-parted, 5 mm. wide; stigmas 3, 2-lobed.
Fruits: Fruit 5-10 cm. long.
Accepted Name:
Vallisneria americana Michx.Synonyms:
Vallisneria americana Michx. var. americana
Vallisneria neotropica Victorin
Vallisneria spiralis L.
Treated in Flora of the PNW as:
Vallisneria americana, Vallisneria spiralis
Additional Resources:
PNW Herbaria Specimens: View list of Vallisneria americana specimens in the Consortium of Pacific Northwest Herbaria database.
WTU Herbarium Specimens: View list of Vallisneria americana specimens in the WTU Herbarium database.
Washington Flora Checklist: Vallisneria americana treatment.
E-Flora BC: Vallisneria americana atlas page.
CalPhotos: Vallisneria americana images.
USDA Plants Database: Vallisneria americana.
Ben Legler, 2004
Ben Legler, 2004
Ben Legler, 2004
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