Distribution: Occurring west of the Cascades crest in counties along the Puget Sound and outer coast; British Columbia to Oregon, east sporadically across the U.S. to the northern Atlantic coast of the U.S. and Canada; circumboreal.
Habitat: Coastal salt marshes.
Flowers: June-September
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Wind
Rhizomatous perennial 3-7 dm. tall.
Leaves alternate, the blades flat, 1.5-3 mm. broad; leaf bases sheathing, the sheaths several, the uppermost extending to above midlength of the flowering stem.
Inflorescence many-flowered, loosely cymose, 3-10 cm. long; perianth 3-4 mm. long, the 6 segments dark brown with a greenish mid-stripe, blunt, and hooded at the tip; stamens 6, the anthers much longer than the filaments.
Capsule ovoid to obovoid, rounded, about equal to the perianth.
Publication: J. Bot. (Desvaux) ii. (1809) 284. 1809.
Juncus gerardii Loisel., orthographic variant [FNA22, HC]
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ssp. gerardi – black grass, Gerard's rush, mud rush
Occurring west of the Cascades crest in counties along the Puget Sound and outer coast; British Columbia to Oregon, east sporadically across the U.S. to the northern Atlantic coast of the U.S. and Canada; circumboreal.
PNW Herbaria: Specimen records of Juncus gerardi in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Juncus gerardi checklist entry
OregonFlora: Juncus gerardi information
E-Flora BC: Juncus gerardi atlas page
CalPhotos: Juncus gerardi photos
