Calamagrostis koelerioides
Calamagrostis cinnoides
dense-pine reed grass, fire reedgrass
Nuttall's reed grass, small reedgrass
(26)60-85(120) cm, unbranched, slightly scabrous;
nodes 2-3(5).
(60) 80-140(170) cm, often solitary, unbranched, scabrous;
nodes 3-5(6).
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.
smooth or slightly scabrous;
collars smooth to densely scabrous;
ligules (2)3-4(6) mm, usually truncate, rarely obtuse, usually entire, sometimes lacerate;
blades (8)10-35(45) cm long, (3)3.5-7.5(10) mm wide, flat, pale green, smooth or slightly scabrous, adaxial surfaces 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.
(8)12-20(25) cm long, (0.8)1.5-2.5(3) cm wide, erect, contracted, green to greenish purple;
branches (2.5)4-7 cm, sparsely to densely scabrous, some prickles more than 10 times the length of the others, spikelets usually confined to the distal 1/2-1/4.
(4)4.5-6(7) mm;
rachilla prolongations 1.5-2.5(3) mm, hairs 1.5-2 mm.
5-7(7.5) mm;
rachilla prolongations about (0.5)1(1.5) mm, hairy only distally, hairs 2-4 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, keels slightly scabrous, lateral veins prominent, apices acuminate, sometimes shortly awned;
callus hairs 3-4 mm, 0.5-0.7 times as long as the lemmas, abundant;
lemmas 4.5-5.5 mm, 1-2 mm shorter than the glumes;
awns 1-2 mm, attached on the upper 2/5 of the lemmas, not exserted, straight;
anthers about 1.5 mm.
= 28.
= unknown.
Calamagrostis koelerioides
Calamagrostis cinnoides
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 cinnoides is found on roadsides, in ditches, pond edges, and boggy streamhead seepages, and along streams in oak or oak-pine woods on sandy to peaty soils, at 5-1100 m. Its range extends throughout eastern North America, from Nova Scotia and Maine to Georgia and Louisiana. It is adventive in Ohio.
Since Arundo canadensis Michx. was cited as a synonym for both Arundo cinnoides Muhl. and Calamagrostis cinnoides, both of these latter combinations are considered to be superfluous—and thus illegitimate—names, even though they differ taxonomically from A. canadensis Michx. A proposal is in preparation to conserve the name C. cinnoides over the less frequently used, but legitimate, combination C. coarctata Eaton.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
