Calamagrostis koelerioides
Calamagrostis ophitidis
dense-pine reed grass, fire reedgrass
serpentine reed grass
(26)60-85(120) cm, unbranched, slightly scabrous;
nodes 2-3(5).
(30) 55-80(100) cm, unbranched, scabrous beneath the panicles;
nodes (1)2(5).
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 usually scabrous, rarely smooth;
ligules (0.5)2-5.5(7) mm, usually truncate, entire to slightly lacerate;
blades (8)10-20(27) cm long, (1.5)2-3(4) mm wide, usually involute, abaxial surfaces usually scabrous, rarely smooth, adaxial surfaces scabrous, glabrous or sparsely hairy, both surfaces with abundant white glands between the veins, visible only with magnification.
(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.
(6)8-11(15) cm long, (1)1.2-1.5 cm wide, contracted, mostly erect, pale green to green;
branches 2-4(4.5) cm, scabridulous, usually spikelet-bearing to the base.
(4)4.5-6(7) mm;
rachilla prolongations 1.5-2.5(3) mm, hairs 1.5-2 mm.
(4.5)5-7(8) mm;
rachilla prolongations about 1.5 mm, hairs 1-2 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, usually scabrous over the entire surface, rarely only the keels scabrous distally, lateral veins prominent, apices acute to acuminate;
callus hairs 1-1.5(2) mm, 0.2-0.4 times as long as the lemmas, sparse;
lemmas 4.5-6.5 mm, 0-2 mm shorter than the glumes;
awns 5-6(8) mm, attached to the lower 1/10 – 1/5 of the lemmas, exserted less than 2 mm, stout, distinguishable from the callus hairs, bent;
anthers (2.5)3-3.5(4) mm.
= 28.
= 28.
Calamagrostis koelerioides
Calamagrostis ophitidis
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 ophitidis grows in meadows, seeps, grasslands, and chaparral, as well as in coniferous forests, on serpentine outcrops and soils, at 50-1100 m. It is known only from Sonoma, Marin, Mendocino, Lake, and Napa counties in California.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
