Festuca thurberi |
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Thurber fescue, Thurber's fescue |
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Habit | Plants densely cespitose, without rhizomes. |
Culms | (45) 60-100(120) cm, glabrous, smooth or scabrous below the inflorescence. |
Sheaths | closed for less than 1/3 their length, smooth or scabrous, persistent; collars glabrous; ligules 2-5(9) mm, entire or lacerate, not ciliate; blades 1.5-3 mm wide, 0.8-1.8 mm in diameter when conduplicate, deciduous, abaxial surfaces scabrous, adaxial surfaces scabrous or pubescent, veins 9-15, ribs 7-13; abaxial sclerenchyma a more or less continuous band; adaxial sclerenchyma present; girders usually formed at the major veins, sometimes only pillars present. |
Inflorescences | (7)10-15(17) cm, open, with 1-2(3) branches per node; branches 4.5-9 cm, lax, erect or spreading, spikelets borne towards the ends of the branches. |
Spikelets | (8)10-14 mm, with (3)4-5(6) florets. |
Glumes | unequal to subequal, ovate-lanceolate, scabrous or smooth, acute; lower glumes (2)3.5-5.5 mm; upper glumes (2.5)4.5-6.5(7) mm; lemmas 6-10 mm, lanceolate to ovate-lanceolate, scabrous or smooth, unawned, sometimes mucronate, mucros to 0.2 mm; paleas shorter than to as long as the lemmas, intercostal region puberulent distally; anthers 3-4.5 mm; ovary apices densely pubescent. |
2n | = 28, 42. |
Festuca thurberi |
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Distribution |
AZ; CO; NM; SC; UT; WY
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Discussion | Festuca thurberi is a large bunchgrass of dry, rocky slopes and hills, open forests, and meadows in montane and subalpine regions, at (1000)2000-3500 m. Its range extends from southern Wyoming south through Utah and Colorado to New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 408. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Festuca > subg. Festuca > sect. Breviaristatae |
Sibling taxa | |
Name authority | Vasey |
Web links |