Calamagrostis scopulorum

M.E. Jones
Common names: Jones' reedgrass Ditch reedgrass
Endemic
Treatment appears in FNA Volume 24. Treatment on page 717.

Plants without sterile culms; loosely cespitose, with rhizomes to 2 cm long, 2-3 mm thick. Culms (40) 50-92 cm, sometimes branched, sparsely to densely scabrous; nodes 2-3. Sheaths and collars smooth or scabrous; ligules (3) 4-7 (9) mm, obtuse, lacerate; blades 10-38 cm long, (2) 3-4 (7) mm wide, flat, scabridulous, adaxial surfaces glabrous or sparsely hairy. Panicles (4) 7-16 (18) cm long, (0.7) 1.1-2 (3) cm wide, nodding, contracted, pale green to purple-tinged; branches 1-5 (6.5) cm, sparsely to densely scabrous, usually spikelet-bearing to the base. Spikelets (4) 4.5-6 mm; rachilla prolongations 1-2 mm, hairy throughout, hairs 1.5-2.5 mm. Glumes keeled, mostly smooth, keels slightly scabrous distally, lateral-veins obscure, apices acuminate; callus hairs 2-3 mm, 0.5-0.6 times as long as the lemmas, somewhat sparse; lemmas 3.5-5 mm, 0.5-1.5 mm shorter than the glumes; awns (0.5) 1-1.5 (2) mm, attached to the upper 2/5 of the lemmas, not exserted, slender, straight, easily overlooked when short; anthers (1.8) 2-2.7 (3) mm. 2n = 28.

Distribution

Colo., N.Mex., Utah, Mont., Ariz., Wyo.

Discussion

Calamagrostis scopulorum grows on canyon slopes and wash bottoms, and in dry to moist montane to alpine habitats, often on rocky, sandy to silty soil, at 1000-3550 m. It grows from western Montana and Wyoming south to Arizona and New Mexico.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Calamagrostis scopulorum"
membranous +  and scarious +
hairy +  and glabrous +
1.8 cm18 mm <br />0.018 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
Kendrick L. Marr +, Richard J. Hebda +  and Craig W. Greenef +
M.E. Jones +
1 (?) +  and 3 (?) +
0.5 cm5 mm <br />0.005 m <br /> (?) +
straight +
attached +
not exserted +  and upper +
indistinct +
slender +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
10 cm100 mm <br />0.1 m <br /> (38 cm380 mm <br />0.38 m <br />) +
not evident +
scabridulous +
flat +  and involute +
3mm;4mm +
6.5 cm65 mm <br />0.065 m <br /> (?) +
appressed;more or less drooping +
spikelike +
0.5-0.6 times as long as the lemmas +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Jones' reedgrass +  and Ditch reedgrass +
ascending +  and erect +
50 cm500 mm <br />0.5 m <br /> (92 cm920 mm <br />0.92 m <br />) +
not woody +
Colo. +, N.Mex. +, Utah +, Mont. +, Ariz. +  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 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
lanceolate +  and ovate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
lacerate +  and obtuse +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
membranous +
inconspicuous +
lanceolate +
concealed +  and prominent +
2 +  and 3 +
2 +  and 1 +
hairy +  and glabrous +
2-keeled +
pale green +  and purple-tinged +
7cm +  and 16cm +
spikelike +
1.1 cm11 mm <br />0.011 m <br /> (2 cm20 mm <br />0.02 m <br />) +
dry +  and fleshy +
1 +  and 60 +
compressed +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Calamagrostis scopulorum +
Calamagrostis +
species +
membranous +
parallel +  and converging +
obscure +  and prominent +
plant +  and cespitose +
aquatic +  and terrestrial +