Calamagrostis koelerioides |
Calamagrostis muiriana |
|
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dense-pine reed grass, fire reedgrass |
Muir's reed grass, mum's reedgrass |
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Habit | Plants without sterile culms; often densely cespitose, with rhizomes 2-6 cm long, 2-4 mm thick. | Plants sometimes with sterile culms; densely cespitose, often with rhizomes 1-3 cm long, 1-2 mm thick. |
Culms | (26)60-85(120) cm, unbranched, slightly scabrous; nodes 2-3(5). |
(10)12-35 cm, unbranched, smooth beneath the panicles; nodes 1-3. |
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. |
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Leaves | basally concentrated; sheaths and collars smooth or scabrous; ligules 1-2.5 mm, obtuse, entire to lacerate; blades (1)4-12 cm long, 0.2-0.4 mm in diameter, involute, abaxial surfaces scabrous, adaxial surfaces 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. |
(1.5)1.9-5.7(7.5) cm long, 0.4-3 cm wide, contracted to open, usually dark purple, rarely straw-colored; branches (0.8)1.1-2(3.5) cm, smooth, spikelets usually confined to the ends of the branches. |
Spikelets | (4)4.5-6(7) mm; rachilla prolongations 1.5-2.5(3) mm, hairs 1.5-2 mm. |
(3)3.5-4.5(5) mm; rachilla prolongations about 2 mm, hairs 0.5-1 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. |
rounded, midvein smooth or slightly scabrous, lateral veins obscure, apices acute to acuminate, rarely awn-tipped; callus hairs (0.2)0.3-0.6 mm, 0.1-0.2 times as long as the lemmas, sparse; lemmas (2.5)3-4 mm, 0.5-1 mm shorter than the glumes; awns 3.5-6 mm, attached to the lower 1/3 of the lemmas, exserted, bent, purple; anthers 0.9-2.5 mm. |
2n | = 28. |
= 28. |
Calamagrostis koelerioides |
Calamagrostis muiriana |
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Distribution |
CA; ID; MT; OR; WA; WY
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CA |
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.) |
Calamagrostis muiriana grows in moist to dry, subalpine and alpine floodplain meadows, lake margins, and stream banks, at 2400-3900 m, in the Sierra Nevadas south of Sonora Pass in central California. It differs from C. bolanderi (p. 719) in having basally concentrated leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 720. | FNA vol. 24, p. 717. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Calamagrostis | Poaceae > subfam. Pooideae > tribe Poeae > Calamagrostis |
Sibling taxa | ||
Name authority | Vasey | B.L. Wilson & Sami Gray |
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