Flora of North America species comparison

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Calamagrostis koelerioides

dense-pine reed grass, fire reedgrass
Habit Plants without sterile culms; often densely cespitose, with rhizomes 2-6 cm long, 2-4 mm thick.
Culms

(26)60-85(120) cm, unbranched, slightly scabrous;

nodes 2-3(5).
Sheaths

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.
Panicles

(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.
Spikelets

(4)4.5-6(7) mm;

rachilla prolongations 1.5-2.5(3) mm, hairs 1.5-2 mm.
Glumes

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.
2n

= 28.

Calamagrostis koelerioides
Distribution
from FNA
CA; ID; MT; OR; WA; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)
Source FNA vol. 24, p. 720.
Parent taxa Poaceae > subfam. Pooideae > tribe Poeae > Calamagrostis
Sibling taxa
C. bolanderi, C. breweri, C. cainii, C. canadensis, C. cinnoides, C. deschampsioides, C. epigejos, C. foliosa, C. howellii, C. lapponica, C. montanensis, C. muiriana, C. nutkaensis, C. ophitidis, C. perplexa, C. pickeringii, C. porteri, C. purpurascens, C. rubescens, C. scopulorum, C. sesquiflora, C. stricta, C. tacomensis, C. tweedyi, C. ×acutiflora
Name authority Vasey
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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