Page authors: Don Knoke, David Giblin
Juncus gerardi ssp. gerardi
black grass, Gerard's rush, mud rush

Distribution: Occurring west of the Cascades crest in counties along the Puget Sound and outer coast; British Columbia south 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: Both native and introduced - occurring in eastern North America, Eurasia.

Conservation Status: Not of concern


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.

Accepted Name:
Juncus gerardi Loisel. ssp. gerardi

Synonyms & Misapplications:
Juncus fucensis H. St. John
Juncus gerardii Loisel. ssp. gerardii, orthographic variant [JPM2]
Juncus gerardii Loisel. var. gerardii, orthographic variant [KZ99]
Juncus gerardii Loisel. var. pedicellatus Fernald [KZ99]
Additional Resources:

PNW Herbaria: Specimen records of Juncus gerardi ssp. gerardi in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Juncus gerardi ssp. gerardi checklist entry.

E-Flora BC: Juncus gerardi ssp. gerardi atlas page.

CalPhotos: Juncus gerardi ssp. gerardi photos.

USDA Plants: Juncus gerardi ssp. gerardi information.

0 photographs:
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