Calamagrostis canadensis var. langsdorfii (Link) Inman
bluejoint reedgrass (bluejoint)
Poaceae (Grass family)

Introduction to Vascular Plants

Photograph

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Map

E-Flora BC Static Map

Distribution of Calamagrostis canadensis var. langsdorfii
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Species Information

General:
Perennial grass from fibrous roots and rhizomes; stems 60-150 cm tall, smooth, with 3 to 8 nodes, often branching above.
Leaves:
Sheath summits smooth to strongly hairy; leaf blades lax, usually flat, rough on both surfaces, often glaucous above, 5-30 cm long, mostly 3-8 mm wide; ligules mostly 3-8 mm long, with jagged margins.
Flowers:
Inforescence an open, lax or sometimes narrow panicle 10-25 cm long, the longer branches 3-8 cm long, sparsely- to densely-flowered on the upper 1/2; spikelets 1-flowered; glumes usually purple-tinged, thin, translucent along the margins, sharp- to long-pointed, usually rough, often bristly on the keels; lemmas thin, 2.5-4.5 mm long, with delicate, straight awns attached just below the middle and extending to or just beyond the tips, the callus hairs copious, mostly of uniform length, about as long as the lemmas; paleas thin, 1/2 to almost as long as the lemmas; rachillas short, inconspicuous, sparsely bearded with long hairs.
Notes:
Two intergrading varieties are recognized in BC and delimitation of each is arbitrary. Variety langsdorfii also intergrades with C. lapponica. The two varieties may be separated as follows:

1. Glumes 3-4 mm long, inconspicuously rough and thin, the keels lacking bristlelike hairs, translucent on the margins; awns thin, not prominent.................... var. canadensis

1. Glumes 4-6 mm long, conspicuously rough, the keels with bristlelike hairs, usually not translucent on the margins; awns thick, more prominent.................. var. langsdorfii (Link) Inman

SourceThe Illustrated Flora of British Columbia

Ecology

Ecological Framework for Calamagrostis canadensis var. langsdorfii

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

Avg

Min

Max

Elevation (metres)
1397 880 1991
Slope Gradient (%)
10 0 42

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

103 60 204
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 1 7
Modal Nutrient Regime
Class
D
# of field plots
 species was recorded in:
8
Modal BEC Zone Class
ICH

All BEC Zones (# of stations/zone) species was recorded in

ESSF(3), ICH(3), SBPS(1), SBS(1)

Habitat and Range

Moist to wet bogs, marshes, meadows, clearings and open forests in the lowland to lower alpine zones; var. canadensis - common throughout BC east of the Coast-Cascade Mountains, rare in coastal BC; var. langsdorfii - common in N BC east of the Coast-Cascade Mountains, less frequent southward; circumboreal, N to AK, YT, NT, E to NF and S to ME, MA, NY, NC, TN, MO, KS, NM, AZ and CA; Eurasia.

SourceThe Illustrated Flora of British Columbia

Synonyms

Synonyms and Alternate Names:
Calamagrostis lactea Beal (pro sp.) [not hybrid]
Calamagrostis canadensis subsp. langsdorfii
Calamagrostis langsdorfii (Link) Trin.
Calamagrostis scabra