Calamagrostis montanensis

(Scribn.) Vasey
Common names: Plains reedgrass
Endemic
Treatment appears in FNA Volume 24. Treatment on page 724.

Plants with sterile culms; ces¬pitose, with rhizomes 6+ cm long, 1-2 mm thick. Culms 15-50 (54) cm, unbranched, usually scabrous, rarely smooth; nodes 1-2. Sheaths and collars smooth or slightly scabrous; ligules (1) 2-3 mm, obtuse to acute, more or less lacerate; blades (5) 8-19 (23) cm long, (1) 2-3 (4) mm wide, usually involute, seldom reaching the panicles, abaxial surfaces scabrous, adaxial surfaces usually scabrous, rarely smooth, glabrous or sparsely hairy. Panicles 4-9 (14) cm long, (0.7) 1-2 (3.5) cm wide, erect, contracted and not or only slightly interrupted, yellowish green with a light purple tinge; branches 1.3-3 (3.7) cm, sparsely short-scabrous to densely long-scabrous, spikelet-bearing to the base. Spikelets (3) 3.5-4.5 (7) mm; rachilla prolongations about 1 mm, densely bearded, hairs to 2 mm. Glumes keeled, smooth or scabrous throughout, lateral-veins usually somewhat obscure, rarely prominent, apices acute to acuminate, rarely awn-tipped; callus hairs (1) 1.5-2 (2.5) mm, 0.4-0.8 times as long as the lemmas, abundant; lemmas (2.5) 3-3.5 (5.5) mm, 0.5-1 (2) mm shorter than the glumes; awns (1) 2-3 (4) mm, usually attached to the lower 1/10 – 2/5 of the lemmas, rarely above the middle, sometimes slightly exserted, stout, distinguishable from the callus hairs, slightly bent; anthers (1.1) 1.8-2.4 (3) mm. 2n = 28.

Distribution

Colo., Minn., N.Dak., S.Dak., Mont., Alta., B.C., Man., Sask., Idaho, Wyo.

Discussion

Calamagrostis montanensis inhabits prairie grass¬lands and sagebrush flats, benchlands, valley bottoms, and occasionally woodlands, at 200-2600 m. It grows in the continental interior from eastern British Columbia (near Fort St. John and Invermere) and adjacent Alberta, south to southern Wyoming and east to Manitoba and western Minnesota. It has also been reported from Peace Point in Wood Buffalo National Park in northeastern Alberta, but this report has not been verified. Calamagrostis montanensis may be mistaken for C. purpurascens (p. 710), but the latter species has hairy adaxial leaf surfaces and longer awns.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Calamagrostis montanensis"
membranous +  and scarious +
hairy +, glabrous +  and smooth +
1.1 cm11 mm <br />0.011 m <br /> (?) +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
Acute (?) +  and Acuminate (?) +
Kendrick L. Marr +, Richard J. Hebda +  and Craig W. Greenef +
(Scribn.) Vasey +
1 (?) +  and 3 (?) +
1 cm10 mm <br />0.01 m <br /> (?) +
straight +
attached +
exserted +  and lower +
distinguishable +
1/10 +  and 2/5 +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
8 cm80 mm <br />0.08 m <br /> (19 cm190 mm <br />0.19 m <br />) +
not evident +
flat +  and involute +
2mm;3mm +
3.7 cm37 mm <br />0.037 m <br /> (?) +
appressed;more or less drooping +
sparsely short-scabrous +  and densely long-scabrous +
spikelike +
0.4-0.8 times as long as the lemmas +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Plains reedgrass +
ascending +  and erect +
15 cm150 mm <br />0.15 m <br /> (50 cm500 mm <br />0.5 m <br />) +
not woody +
Colo. +, Minn. +, N.Dak. +, S.Dak. +, Mont. +, Alta. +, B.C. +, Man. +, Sask. +, Idaho +  and Wyo. +
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 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
prominent +  and obscure +
lanceolate +  and ovate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
lacerate +, obtuse +  and acute +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
membranous +
inconspicuous +
lanceolate +
concealed +  and prominent +
1 +  and 2 +
2 +  and 1 +
hairy +  and glabrous +
2-keeled +
yellowish green +
4cm +  and 9cm +
spikelike +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
dry +  and fleshy +
1 +  and 60 +
compressed +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Calamagrostis montanensis +
Calamagrostis +
species +
membranous +
parallel +  and converging +
obscure +  and prominent +
aquatic +  and terrestrial +