Distribution: Occurring west of the Cascades crest in Washington; Washington to Baja California, east to the Atlantic Coast.
Habitat: Fresh water habitats.
Flowers: June-August
Origin: Native
Growth Duration: Annual
Conservation Status: Not of concern
Pollination: Water
Monoecious, submersed annual, the slender, branching stems 3-6 dm. long and scarcely 1 mm. thick.
Leaves opposite, 1-3 cm. long and 0.5 mm. broad, the base expanded for 3-5 mm. and somewhat sheathing, the blade tapered from well above midlength to a tip.
Flowers tiny, in the axils of leaves clustered toward the branch tips; staminate flowers few, a single stamen enclosed in a transparent bract; anther 4-celled; pistillate flowers naked, the pistil 1, the stigmas 2-4, sessile, elongate.
Achene spindle-shaped, 3 mm. long, completely filled by the single seed, which is straw-colored and prominently pitted.
Publication: Beitrage zur Kenntniss der Gattung Najas. 8. 1870.
- ssp. guadalupensis – Guadalupe naias, common water-nymph, Guadalupe water-nymph Occurring west of the Cascades crest in Washington; Washington to Baja California, east to the Atlantic Coast.
PNW Herbaria: Specimen records of Najas guadalupensis in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Najas guadalupensis checklist entry.
OregonFlora: Najas guadalupensis information.
E-Flora BC: Najas guadalupensis atlas page.
CalPhotos: Najas guadalupensis photos.
USDA Plants: Najas guadalupensis information.
