E-Flora BC: Electronic Atlas of the Flora of British Columbia

Juncus marginatus Rostk.
grass-leaf rush (grassleaf rush)
Juncaceae (Rush family)

Introduction to Vascular Plants
Once images have been obtained, photographs of this species will be displayed in this window.Click on the image to enter our photo gallery.
Currently no image is available for this taxon.
E-Flora BC Static Map
Distribution of Juncus marginatus
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.

Perennial herb from short, knotty rhizomes, often forming clumps; stems erect, 20-50 cm tall.
Mostly on the lower part of the stems, flat, 3-5 mm wide, the uppermost blades usually shorter than the sheaths or sometimes bladeless, with short, rounded, ear-shaped lobes; sheaths open.
Inflorescence appearing as if it is on the side of the stem, very compacted to much branched, relatively open and more or less obpyramidal, 2-15 cm long, the branches erect, the heads with several to ca. 200 clusters with 2-several flowers per cluster; outer perianth segments shorter than the inner, the latter about equalling the capsules, the outer somewhat keeled, short-pointed, ending in a callus tip, the inner much broader, with broader translucent margins toward the rounded tips; stamens 6; anthers lanceolate, about 1 mm long.
Capsules, plump, broadly elliptic to egg-shaped, reddish-brown, lustrous, the summits rounded, 2-2.5 mm long, about as long as the perianth segments; seeds irregular in size, shape and surface-markings, symmetrical to very asymmetrical, oblong, blunt or with short tails at the tips, the surfaces from evenly, finely net-veined to longitudinally dark-ridged or darkly net-veined, pale to dark amber.
The first collection of this species in BC was made by F. Lomer in 1998.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA

Habitat / Range

Moist roadsides and paths in the lowland zone; rare in SW BC, known only from Coquitlam; introduced from E North America.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Juncus aristulatus auct. non Michx.
Juncus aristulatus var. biflorus (Elliot) Small
Juncus marginatus var. biflorus (Elliot) Alph. Wood
Juncus marginatus var. marginatus
Juncus marginatus var. odoratus Torr.
Juncus marginatus var. setosus Coville
Juncus setosus (Coville) Small

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References