MANUAL OF THE GRASSES OF THE UNITED STATES 59 



Section 2. Eufestuca 



la. Blades flat, rather soft and lax (except in F. kingii), mostly more than 3 mm 

 wide. 

 Lemmas awned, the awn usually more than 2 mm long. 



Floret long-stipitate, the rachilla appearing to be jointed a short distance 



below the floret 14. F. stjbuliflora. 



Floret not stipitate. 



Lemmas indistinctly nerved; awn terminal; blades 3 to 10 mm wide. 



15. F. STJBULATA. 



Lemmas distinctly 5-nerved; awn from between 2 short teeth; blades 2 to 



4 mm wide 16- F. elmeri. 



Lemmas awnless or with an awn rarely as much as 2 mm long. 



Spikelets oblong to linear, mostly 8- to 10-flowered and more than 10 mm 



l ong 17. F. ELATIOR. 



Spikelets" ovate or oval, mostly not more than 5-flowered, less than 10 mm 

 long. 

 Panicles narrow, the branches short, appressed; blades firm, erect. 



18. F. KINGII. 



Panicles open, the branches spreading, naked below; blades lax, spreading. 



Lemmas acuminate, sometimes with an awn as much as 2 mm long, 



membranaceous, distinctly nerved, 6 to 9 mm long. 19. F. sororia 



Lemmas awnless, obtuse to acutish, rather firm, indistinctly nerved. 



Lemmas 5 to 7 mm long, acutish 20. F. versuta. 



Lemmas about 4 mm long, relatively blunt, rather turgid. 



Spikelets loosely scattered in a very open panicle with long slender 



branches 21. F. obtusa. 



Spikelets somewhat aggregate toward the ends of rather short 



branches of a less open nodding panicle 22. F. shortii. 



lb. Blades involute or if flat less than 3 mm wide (sometimes flat in F. calif ornica 

 but firm and soon involute). 

 Ligule 2 to 4 mm long or longer. Lemmas awnless or cuspidate. 



Lemmas 7 mm long 23. F. thtjrberi. 



Lemmas 4 mm long 24. F. ligtjlata. 



Ligule short. . 



Collar and mouth of sheath villous. Culms tall and stout (rather short in 



var. parishii) 26. F. californica. 



Collar and mouth of sheath not villous. 



Panicle branches denselv ciliate on the angles. Blades about 1 mm wide, 



flat or folded 27. F. dasyclada. 



Panicle branches not ciliate on the angles. 



Culms decumbent at the usually red, fibrillose base, in loose tufts. Awn 

 of lemma shorter than the body; blades smooth. __ 29. F. rubra. 

 Culms erect. 



Lemmas 7 to 10 mm long, scabrous. Culms densely tufted, rather 

 stout, usually scabrous below the panicle; lemmas acute, rarely 



short-awned 25. F. scabrella. 



Lemmas mostly not more than 7 mm long. 

 Lemmas awnless (see also F. arizonica). 



Lemmas 6 to 7 mm long; culms slender, loosely tufted. 



28. F. viridtjla. 



Lemmas about 3 mm long 32. F. capillata. 



Lemmas awned. 



Awn as long as or longer than body of the lemma; blades soft, 



glabrous, sulcate 30. F. occidentalis. 



Awn shorter than body of the lemma; blades slender, numerous, 

 usually scabrous. 

 Blades mostly not more than half as long as the culms; pan- 

 icle narrow, often almost spikelike, few-flowered, mostly 

 less than 10 cm long; culms mostly less than 30 cm tall. 



31. F. OVINA. 

 Blades elongate; panicles 10 to 20 cm long, somewhat open; 

 culms 30 to 100 cm tall. 



Awn 2 to 4 mm long 33. F. idahoensis. 



Awn short or obsolete 34. F. arizonica. 



