Festuca thurberi |
Festuca baffinensis |
|
---|---|---|
Thurber fescue, Thurber's fescue |
Baffin fescue, Baffin Island fescue |
|
Habit | Plants densely cespitose, without rhizomes. | Plants densely cespitose, without rhizomes. |
Culms | (45) 60-100(120) cm, glabrous, smooth or scabrous below the inflorescence. |
5-25(30) cm, densely pubescent or shortly pilose near 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. |
closed for about 1/2 their length, glabrous, persistent or slowly shredding into fibers; collars glabrous; ligules 0.1-0.3 mm; blades (0.4)0.6-1(1.2) mm in diameter, conduplicate, abaxial surfaces smooth or sparsely scabrous, adaxial surfaces scabrous or puberulent, veins (3)5-7, ribs 3-5; abaxial sclerenchyma in 3-7 small strands, usually less than twice as wide as high; adaxial sclerenchyma absent. |
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. |
1.5-4(5) cm, contracted, usually panicles, rarely racemes, usually somewhat secund, with 1-2 branches per node; branches erect, lower branches with 2+ spikelets. |
Spikelets | (8)10-14 mm, with (3)4-5(6) florets. |
(4.5)5-7.5(8.5) mm, with (2)3-5(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. |
exceeded by the upper florets, ovate-lanceolate, scabrous distally; lower glumes 2.2-3.7(4) mm; upper glumes 3-5 mm; lemmas (3.5)4-6 mm, scabridulous near the apices, awns 0.8-2.6(3.3) mm, terminal; paleas slightly shorter than to as long as the lemmas, intercostal region scabrous distally; anthers 0.3-0.7 (1.1) mm; ovary apices usually with a few hairs, rarely glabrous. |
Flag | leaf sheaths usually somewhat loosely enclosing the culms; flag leaf blades 0.5-4 cm. |
|
2n | = 28, 42. |
= 28. |
Festuca thurberi |
Festuca baffinensis |
|
Distribution |
AZ; CO; NM; SC; UT; WY
|
AK; CO; ID; MT; UT; WY; AB; BC; NT; NU; ON; QC; YT; Greenland |
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.) |
Festuca baffinensis grows chiefly in damp, exposed, gravelly areas in calcareous and volcanic regions. It is circumpolar in distribution, growing in arctic and alpine habitats and extending southward in the Rocky Mountains to Colorado. It has frequently been included in F. ovina (p. 422). It may hybridize with F. brachyphylla (p. 428) and/or other species to form F. viviparoidea (p. 436). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 408. | FNA vol. 24, p. 432. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Festuca > subg. Festuca > sect. Breviaristatae | Poaceae > subfam. Pooideae > tribe Poeae > Festuca > subg. Festuca > sect. Festuca |
Sibling taxa | ||
Name authority | Vasey | Polunin |
Web links |