Calamagrostis rubescens |
Calamagrostis muiriana |
|
---|---|---|
pine reed grass, pinegrass |
Muir's reed grass, mum's reedgrass |
|
Habit | Plants sometimes with sterile culms; sometimes loosely cespitose, usually with rhizomes 15+ cm long, 1.5-2 mm thick. | Plants sometimes with sterile culms; densely cespitose, often with rhizomes 1-3 cm long, 1-2 mm thick. |
Culms | (50)60-100(105) cm, unbranched, usually smooth, rarely slightly scabrous beneath the panicles; nodes (1)2-3(4). |
(10)12-35 cm, unbranched, smooth beneath the panicles; nodes 1-3. |
Sheaths | smooth or slightly scabrous; collars often hairy, rarely glabrous; ligules (2)3-5(6) mm, truncate to obtuse, often lacerate; blades (6)8-40(42) cm long, (1)2-5(8) mm wide, usually flat, abaxial surfaces smooth or slightly scabrous, adaxial surfaces smooth or scabrous, glabrous or sparsely hairy. |
|
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 | (5)6-15(25) cm long, (0.7)1.5-2(2.7) cm wide, contracted to somewhat open, erect, usually greenish, infrequently purplish; branches (1.2)2-4(10) cm, usually slightly scabrous, rarely densely long-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 | (3)4-4.5(5.5) mm; rachilla prolongations 0.6-1.5(2) mm, hairs 1.2-2 mm. |
(3)3.5-4.5(5) mm; rachilla prolongations about 2 mm, hairs 0.5-1 mm. |
Glumes | rounded to slightly keeled, mostly smooth, keels rarely slightly scabrous, lateral veins usually obscure, rarely prominent, apices acute; callus hairs (0.5)1-1.5(2.5) mm, 0.2-0.5(0.7) times as long as the lemmas, sparse; lemmas 2.5-3.5(4) mm, (0.5)1-2 mm shorter than the glumes; awns 2.8-3.5(4.5) mm, usually attached to the lower 1/5 of the lemmas, rarely higher, exserted, stout and readily distinguished from the callus hairs, strongly bent; anthers (1)1.3-2(2.6) 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, 42, 56. |
= 28. |
Calamagrostis rubescens |
Calamagrostis muiriana |
|
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; MB; SK
|
CA |
Discussion | Calamagrostis rubescens grows at 50-2800 m, usually in open montane pine or aspen forests and parklands, infrequently in sagebrush steppes, chaparral, and meadows. It is primarily a species of interior western North America, although it reaches the Pacific coast in southern California. The distribution extends from central British Columbia and Alberta east to the Cypress Hills of eastern Alberta and the Pasquia and Cub hills of Saskatchewan, south to western California, Nevada, northeastern Utah, and central Colorado. It is considered threatened in Saskatchewan. Calamagrostis rubescens is similar to C. koelerioides (p. 721). The two have traditionally been distinguished by the presence of hairs on the leaf collars of C. rubescens, and their absence from C. koelerioides; a more reliable differentiation is the shorter lemmas, glumes, and awns of C. rubescens. Calamagrostis rubescens and C. porteri (p. 721) appear to be closely related. They may be part of the general phenomenon of eastern and western vicariants. (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. | FNA vol. 24, p. 717. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Calamagrostis | Poaceae > subfam. Pooideae > tribe Poeae > Calamagrostis |
Sibling taxa | ||
Name authority | Buckley | B.L. Wilson & Sami Gray |
Web links |
|