Calamagrostis lapponica (Wahlenb.) Hartman
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Family: Poaceae
Genus: Calamagrostis
Species Synonyms: Calamagrostis lapponica var. alpina Hartman
Calamagrostis lapponica var. groenlandica Lange
Calamagrostis lapponica var. nearctica Porsild
Common Names: lapland reedgrass
Canada: Yukon – Mackenzie – Keewatin – Ungava – Labrador – southern Baffin Island, south to British Columbia – southwestern Alberta – northern Saskatchewan – Manitoba – Quebec – Newfoundland
Saskatchewan: northern Saskatchewan; Lake Athabasca – Hasbala Lake – La Loche
Ecoregion: Mid-Boreal Upland, Athabasca Plain, Churchill River Upland, Tazin Lake Upland, Selwyn Lake Upland
Saskatchewan: moist to dry clearings and fen margins in boreal forest
Canada: moist, sandy or gravel ground
Provincial Status According
to Harms (2003):
Nature Conservancy Status:
G5 S2S3
Saskatchewan Species at
Risk Status:
Lapland reedgrass is vulnerable because it is rare or uncommon in Saskatchewan. It occurs in two or three general regions of the province and is usually locally numerous within limited areas. No threats are known or anticipated.
Height: 30 – 60 cm
Roots: rhizome short, thin
Stem: loosely tufted, slender, erect, with 2 or 3 nodes, hairless or rough below panicle
Leaves: blades 2 – 3 mm wide, flat or rolled under, upper surface rough, lower surface smooth; sheaths hairless; ligules 0.5 – 3 mm long
Inflorescence: branched, open or contracted, 5 – 15 cm long, 1 – 2 cm wide, often purple
Florets: glumes 4 – 5.5 mm long, tips tapered to a point, slightly shiny, slightly hairy on keel; hardened thickening below lemma with unequal hairs; lemmas shorter than glumes, 3.5 – 5 mm long; lemma awn slender, almost straight, shorter than lemma
Fruits: grain
1 Lemma awn bent, usually protruding from glumes; hairs on hardened thickenings below lemma much shorter than lemma
1 Lemma awn straight or nearly so, usually included in glumes; hairs on hardened thickenings below lemma usually nearly equal to lemma
2 Awn greatly exceeding glumes
C. purpurascens
2 Awn about equalling glumes
3 Plants rhizomatous not tufted; stems rough below the inflorescence; glumes boat-shaped; spikelets strongly flattened; collar hairless
C. montanensis
3 Plants tufted, often with short rhizomes; stems smooth below inflorescence; glumes not boat-shaped; spikelets not strongly flattened; collar hairy
C. rubescens
4 Inflorescence loose, open, branches often drooping; blades flat; plants frequently taller than 90 cm
4 Inflorescence contracted; blades flat or rolled; plants generally less than 90 cm tall
5 Spikelets to 6 mm long; glumes narrow, strongly boat-shaped; awn inserted on the lower third of lemma
C. canadensis var. langsdorfii
5 Spikelets to 4 mm long; glumes rounded on the back, not strongly boat-shaped; awn inserted about the middle of lemma
6 Glumes distinctly exceeding the lemma
C. canadensis var. canadensis
6 Glumes shorter than or nearly equal to the lemma
C. canadensis var. macouniana
7 Glumes 3 – 4 mm long; hairs on hardened thickening below lemma about equal to lemma; inflorescence lax, purplish
C. lapponica
7 Glumes 2 – 3 mm long; hairs on hardened thickening below lemma shorter than lemma; inflorescence stiff, usually brownish
8 Leaves smooth or sometimes rough hairy at tip and on margins, to 4 mm broad, rolled; ligules 1 – 3 mm long, entire
C. stricta ssp. stricta
8 Leaves harsh and rough, flat, to 8 mm wide; ligules over 3 mm long, appearing torn
C. stricta ssp. inexpansa