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Montana Field Guide

Montana Field Guides

Black-grass Rush - Juncus gerardii
Other Names:  Saltmeadow Rush, Saltmarsh Rush, Black Needle Rush

Non-native Species

Global Rank: G5
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Rhizomatous. Stems erect, terete, 10–40 cm. Leaves basal and cauline; blades flat or channeled, ca. 1 mm wide; auricles obscure. Inflorescence open with 10 to 30 pedicellate flowers; main bract smaller than the inflorescence. Flowers with prophylls; tepals green to tan, 2.5–3 mm long, rounded, hood-like, subequal; stamens 6. Capsules ca. 2.5 mm long, truncate on top; seeds without appendages (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Sporadic across northern U.S. and adjacent Canada, Eurasia, possibly introduced in at least part of the North American range. Known from Madison County (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 3

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)



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Citation for data on this website:
Black-grass Rush — Juncus gerardii.  Montana Field Guide.  .  Retrieved on , from