Calamagrostis canadensis var. langsdorffii

(Link) Inman
Synonyms: Calamagrostis langsdorffii Calamagrostis canadensis var. scabra Calamagrostis canadensis var. lactea
Treatment appears in FNA Volume 24. Treatment on page 728.

Culms (32) 65-110 (180) cm, often branching above the base, smooth or slightly scabrous beneath the panicles; nodes (2) 3-5 (8). Sheaths and collars smooth or scabrous; ligules (3) 5-8 (12) mm; blades (11) 18-29 (50) cm long, (2) 3-7 (11) mm wide, adaxial surfaces usually strongly scabrous, rarely smooth, often glaucous. Panicles (6) 9-15 (25) cm long, (1.5) 2.5-4 (8) cm wide, often contracted when young, usually purplish, sometimes greenish to straw-colored; branches (2.7) 3.5-6 (12) cm. Spikelets (3.5) 4-4.5 (5.2) mm; rachilla prolongations 0.7-1 mm, hairs 2-3 mm. Glumes keeled, usually scabrous throughout, rarely smooth, prickles on the keels hairlike, often bent, lateral-veins obscure to prominent, apices acuminate; callus hairs (1.5) 3-3.3 (4.5) mm, (0.5) 1-1.2 (1.5) times as long as the lemmas; lemmas (2.3) 2.5-3 (4) mm, 0.4-2.1 mm shorter than the glumes; awns 1.2-3.1 mm, attached to the lower (1/10) 1/5 – 2/5 (1/2) of the lemmas, not exserted, usually straight; anthers (0.9) 1.2-1.6 (2.6) mm. 2n = 28, 42, 56.

Distribution

N.H., Minn., Colo., Wash., N.Y., Alaska, Alta., B.C., Greenland, Man., Nfld. and Labr., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Oreg., Mont., Vt., Ga., Calif.

Discussion

A circumboreal taxon, Calamagrostis canadensis var. langsdorffii grows from Alaska to Greenland and south to northern California, Colorado, Minnesota, New Hampshire, and New York.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

56 +, 42 +  and 28 +
membranous +  and scarious +
0.9 cm9 mm <br />0.009 m <br /> (?) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
Kendrick L. Marr +, Richard J. Hebda +  and Craig W. Greenef +
(Link) Inman +
1 (?) +  and 3 (?) +
straight +
attached +
not exserted +
indistinct +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.31 cm3.1 mm <br />0.0031 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
18 cm180 mm <br />0.18 m <br /> (29 cm290 mm <br />0.29 m <br />) +
not evident +
flat +  and involute +
3mm;7mm +
2.7 cm27 mm <br />0.027 m <br /> (?) +
appressed;more or less drooping +
spikelike +
(0.5)1-1.2(1.5) times as long as the lemmas +
0.3 cm3 mm <br />0.003 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
ascending +  and erect +
65 cm650 mm <br />0.65 m <br /> (110 cm1,100 mm <br />1.1 m <br />) +
not woody +
N.H. +, Minn. +, Colo. +, Wash. +, N.Y. +, Alaska +, Alta. +, B.C. +, Greenland +, Man. +, Nfld. and Labr. +, N.W.T. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Oreg. +, Mont. +, Vt. +, Ga. +  and Calif. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
sterile +  and bisexual +
compressed +
reduced +
subtending +
subequal +
membranous +
sparse +  and abundant +
uncinate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
obscure +  and prominent +
lanceolate +  and ovate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
lacerate +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
membranous +
inconspicuous +
lanceolate +
8 (?) +  and 2 (?) +
concealed +  and prominent +
3 +  and 5 +
2 +  and 1 +
hairy +  and glabrous +
2-keeled +
greenish +  and straw-colored +
9cm +  and 15cm +
spikelike +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
dry +  and fleshy +
1 +  and 60 +
compressed +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Calamagrostis langsdorffii +, Calamagrostis canadensis var. scabra +  and Calamagrostis canadensis var. lactea +
Calamagrostis canadensis var. langsdorffii +
Calamagrostis canadensis +
variety +
membranous +
parallel +  and converging +
obscure +  and prominent +
aquatic +  and terrestrial +