Calamagrostis koelerioides
Calamagrostis montanensis
dense-pine reed grass, fire reedgrass
plains reedgrass, prairie reedgrass
(26)60-85(120) cm, unbranched, slightly scabrous;
nodes 2-3(5).
15-50(54) cm, unbranched, usually scabrous, rarely smooth;
nodes 1-2.
and collars usually scabrous, rarely smooth, glabrous;
ligules (1.5) 2-4.5(7) mm, truncate to obtuse, entire or sometimes lacerate;
blades (2)9-20(30) cm long, (2)2.5-4.5(8) mm wide, flat, slightly scabrous, adaxial surfaces glabrous or sparsely hairy.
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.
(4)10-13(16) cm long, about 1 cm wide, contracted, erect to slightly nodding, often slightly interrupted towards the base, straw-colored or pale green to pale purple;
branches (1.1)2.8-4(6) cm, scabrous, spikelet-bearing to the base.
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.
(4)4.5-6(7) mm;
rachilla prolongations 1.5-2.5(3) mm, hairs 1.5-2 mm.
(3)3.5-4.5(7) mm;
rachilla prolongations about 1 mm, densely bearded, hairs to 2 mm.
slightly keeled, keels smooth or slightly scabrous distally, lateral veins visible but not prominent, apices acute;
callus hairs 1.5-2 mm, 0.3-0.4 times as long as the lemmas, sparse;
lemmas (3.5)4-5(6) mm, 0.5-1.5 mm shorter than the glumes;
awns 4-5.5 mm, attached to the lower 1/10 – 1/5 of the lemmas, exserted, sometimes barely so, stout, distinguishable from the callus hairs, bent;
anthers 2-3.5 mm.
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.
= 28.
= 28.
Calamagrostis koelerioides
Calamagrostis montanensis
Calamagrostis koelerioides grows in mountain meadows, chaparral, and Jeffrey pine and blue spruce forests, and on talus slopes, dry hills, and ridges, occasionally on serpentine soils, at 50-2100 m. It extends from Washington south to southern California and east to Montana and western Wyoming.
Calamagrostis koelerioides is similar to C. rubescens (p. 723). The two have traditionally been distinguished by the presence of hairs on the leaf collars in C. rubescens, and their absence in C. koelerioides; a more reliable differentiation is the longer lemmas, glumes, and awns of C. koelerioides compared to C. rubescens.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Calamagrostis montanensis inhabits prairie grasslands 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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
BC
MN Wildflowers
