Blooms: June-August
Habit: herb
Duration: perennial
Origin: Native
Distribution: East of the Cascades in Washington; British Columbia south to California, east to Minnesota and Wisconsin
Habitat: Marshy areas, often in standing water.
Habit: herb
Duration: perennial
Origin: Native
Distribution: East of the Cascades in Washington; British Columbia south to California, east to Minnesota and Wisconsin
Habitat: Marshy areas, often in standing water.
Species Description:
General: Aquatic, scapose perennials, the scapes 0.5-3 dm. tall, often exceeded by the leaves.
Leaves: Leaves all basal, long-petiolate, the blades from narrowly linear to linear-lanceolate or narrowly elliptic, up to 2 cm. broad, often floating when linear.
Flowers: Flowers in compound, bracteate, terminal panicles, the panicles branches in 2-4 whorles along the axis, the branches with one whorl of pedicles, the upper whorl reduced, the flowers on pedicles from the axis; sepals 3, 2.5 mm. long, greenish, purple-margined, persistent; petals 3, slightly larger than the sepals, reddish- or purplish-tinged; stamens 6, opposite the petals; pistils 10-20 in a single whorl, the sub-terminal style short, persistent.
Fruits: Achenes sub-orbicular, 2 mm. broad, the style somewhat curled.
General: Aquatic, scapose perennials, the scapes 0.5-3 dm. tall, often exceeded by the leaves.
Leaves: Leaves all basal, long-petiolate, the blades from narrowly linear to linear-lanceolate or narrowly elliptic, up to 2 cm. broad, often floating when linear.
Flowers: Flowers in compound, bracteate, terminal panicles, the panicles branches in 2-4 whorles along the axis, the branches with one whorl of pedicles, the upper whorl reduced, the flowers on pedicles from the axis; sepals 3, 2.5 mm. long, greenish, purple-margined, persistent; petals 3, slightly larger than the sepals, reddish- or purplish-tinged; stamens 6, opposite the petals; pistils 10-20 in a single whorl, the sub-terminal style short, persistent.
Fruits: Achenes sub-orbicular, 2 mm. broad, the style somewhat curled.
Accepted Name:
Alisma gramineum Lej.Synonyms:
Alisma geyeri Torr.
Alisma gramineum Lej. var. angustissimum (DC.) A.J. Hendricks
Alisma gramineum Lej. var. gramineum
Treated in Flora of the PNW as:
Alisma gramineum vars. angustissimum, gramineum
Additional Resources:
PNW Herbaria Specimens: View list of Alisma gramineum specimens in the Consortium of Pacific Northwest Herbaria database.
WTU Herbarium Specimens: View list of Alisma gramineum specimens in the WTU Herbarium database.
Washington Flora Checklist: Alisma gramineum treatment.
E-Flora BC: Alisma gramineum atlas page.
CalPhotos: Alisma gramineum images.
USDA Plants Database: Alisma gramineum.
Clayton J. Antieau, 1995
Clayton J. Antieau, 1995
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