Festuca idahoensis |
Festuca auriculata |
|
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blue bunchgrass, blue fescue, bluebunch fescue, Idaho fescue |
eared fescue, lobed fescue |
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Habit | Plants densely cespitose, without rhizomes. | Plants densely cespitose, without rhizomes. |
Culms | 25-85 (100) cm, usually smooth, glabrous, occasionally scabrous below the inflorescences. |
8-25(40) cm, erect, smooth, glabrous or pubescent below the inflorescence. |
Sheaths | closed for less than 1/2 their length, smooth or scabrous, rarely pilose, persistent; collars glabrous; ligules 0.2-0.6 mm; blades (0.3)0.5-0.9(1.5) mm in diameter, conduplicate, abaxial surfaces smooth or scabrous, adaxial surfaces scabrous or pubescent, rarely pilose, often glaucous or bluish, veins (3)5(7), ribs (1)3-5, well defined; abaxial sclerenchyma in 5-7 wide, irregular strands; adaxial sclerenchyma absent. |
closed for about 1/2 their length, smooth or scabrous, glabrous or puberulent, persistent; collars glabrous; ligules 0.1-0.5 mm; blades 0.4-0.8(1) mm in diameter, conduplicate, abaxial surfaces glabrous, pubescent, or pilose, all conditions often present on the same plant, scabrous at the apices, adaxial surfaces scabrous or pubescent on the ribs, veins 5-7, ribs 3-5, 1 distinct and 2-4 indistinct; abaxial sclerenchyma in 3 strands, 2 marginal and 1 opposite the midvein, rarely with 2 additional strands, the strands narrower than the veins and usually less than twice as wide as high; adaxial sclerenchyma strands absent; flag leaf blades 0.5-2 cm. |
Inflorescences | (5)7-15(20) cm, loosely contracted or open, with 1-2 branches per node; branches usually somewhat spreading at maturity, sometimes erect, rarely reflexed, lower branches with 2+ spikelets. |
2-3.5 cm, racemes or panicles, contracted, with 1(2) branches per node; branches erect, lower branches usually with 1-2 spikelets. |
Spikelets | (5.8) 7.5-13.5(19) mm, with (2)4-7(9) florets. |
5-6.5(8) mm, with 3-5(6) florets. |
Glumes | exceeded by the upper florets, ovate-lanceolate to lanceolate, mostly smooth, sometimes scabrous distally; lower glumes 2.4-5(6) mm; upper glumes 3-6(8) mm; lemmas 5-8.5(10) mm, scabrous at the apices, awns (1.5)3-6(7) mm, usually more than 1/2 as long as the lemma bodies; paleas shorter than to about as long as the lemmas, intercostal region scabrous or puberulent distally; anthers 2.4-4.5 mm; ovary apices glabrous. |
exceeded by the upper florets, ovate to lanceolate, glabrous, sometimes scabrous distally; lower glumes about 3 mm; upper glumes about 4 mm; lemmas 4-5 mm, ovate to ovate-lanceolate, glabrous, sometimes scabrous towards the apices, apices acute, awns 0.8-2(2.5) mm, terminal; paleas about as long as the lemmas, intercostal region smooth or scabrous distally; anthers 2-3.5 mm; ovary apices glabrous. |
2n | = 28. |
= 14. |
Festuca idahoensis |
Festuca auriculata |
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Distribution |
AZ; CA; CO; ID; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; SK
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AK; YT |
Discussion | Festuca idahoensis grows in grasslands, open forests, and sagebrush meadow communities, mostly east of the Cascade Mountains, from southern British Columbia eastward to southwestern Saskatchewan and southward to central California and New Mexico. It extends up to 3000 m in the southern part of its range. It is often a dominant plant, and provides good forage. The young foliage is particularly palatable. Festuca idahoensis differs from F. arizonica (see previous), with which it is sometimes confused, in its less prominently ribbed blades and glabrous ovary apices. It has frequently been included in F. ovina (p. 422). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Festuca auriculata is an amphiberingian species that extends from the Ural Mountains of Russia through Alaska to the western continental Northwest Territories. It grows on dry, rocky cliffs and slopes, in low arctic and alpine regions. In the Flora region, this species seems to intergrade with, and is sometimes included in, F. lenensis (see next). The two species tend to differ in their leaf surfaces as well as in the width of their sclerenchyma strands. Festuca auriculata has also frequently been included in F. ovina (p. 422). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 438. | FNA vol. 24, p. 424. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Festuca > subg. Festuca > sect. Festuca | Poaceae > subfam. Pooideae > tribe Poeae > Festuca > subg. Festuca > sect. Festuca |
Sibling taxa | ||
Synonyms | F. idahoensis var. oregona | |
Name authority | Elmer | Drobow |
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