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

Juncus nodosus L.
tuberous rush (knotted rush)
Juncaceae (Rush family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #5678)

E-Flora BC Static Map
Distribution of Juncus nodosus
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Species Information

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General:
Perennial herb from elongated rhizomes, the rhizomes with swollen nodes; stems arising singly, erect, 20-40 cm tall.
Leaves:
Located along the length of the stem, nearly circular in cross-section, tapered, the early leaves stiff, with prominent complete cross-walls; sheaths open, with minute, pointed, ear-shaped lobes.
Flowers:
Inflorescence terminal, 3-5 cm long, with (1) 3- to 15-flowered, globe-shaped heads, the heads less than 1 cm wide when pressed, the branches erect; perianth segments greenish-brown to tawny, 3-4 mm long, pointed, the inner about the same length as the outer; stamens 6; anthers 0.6-0.7 mm long, shorter than the filaments; involucral bract longer than inflorescence.
Fruits:
Capsules, narrowly three-angled, cone-shaped, pointed, uniformly tapered into short tips, longer than the perianth segments; seeds barrel-like, about 0.4 mm long, lacking tail-like appendages.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Green
Blooming Period:
Summer
Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall
Source:  The USDA

Habitat / Range

Lakeshores and marshes in the lowland, steppe and montane zones; infrequent throughout BC, mostly E of the Coast-Cascade Mountains; N to AK, YT and NT, E to NF, and S to MA, PA, VA, IN, CO, UT, NV and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Juncus nodosus

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 765 996 1212
Slope Gradient (%) 0 0 0
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 7 8
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
5
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: IDF(3), MS(1), SBS(1)

Climate

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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References