»3^ 



PIPEK NORTH AMERICATf SPECIES OP FESTUCA, 



9 



Spikelets not at all hirsute. 

 Spikelet^ with glumes only hirsute, 

 Spikeletg with lemma only hirsute. 

 Spikelets wholly hirsute. 

 Florets mostly 1 to 3 in each spikelet; all the spikelets 



divaricate. 

 Spikelets not at all pubescent. 

 Spikelets with only the lemma pubscent. 

 Spikelets wholly pubescent. 

 Branches of the narrow elongated panicle erect or appressed. 

 Fir^t glume one- third to one-half as long as the second. 

 Lemma Jiot ciliate. 

 Lemma ciliate. 

 First glume two-thirds to three-fourths as long as the 

 second. 



Lemma smooth or scabrous. 

 Lemma pubescent. 



2. pacijica. 



3. confxtm, 



4. erioJepl^, 



5. 



grayx 



6. reflex a. 



7. Tnicrostachys, 



8. ea^hvoodae. 



9. myuros. 



10. megalura. 



11, hromoides 



12. sciurea. 



Subgenus EuFESTucA. Perennials, mostly tufted and never with scaly rootstocks; 

 stamens 3, protruding in unthesis; stigmas bilaterally plumose, the branches toothed. 



Plants densely tufted, or with narrow and involute blades, usually 

 both; lemma awnless or awned. 

 Ligule short; collar and auricles not conspicuously bristly, or 



tomentose. 



Blades not falling away from the sheaths; palea obtuse or 



L*i. rubra. 



14. ocddentalis 



15. ovincu 



bidentate at apex. 

 Innovations extra vaginal; blades smooth; spikelets 



usually more or less glaucous* 

 Innovations intravaginal. 



Tufts easily separable; blades closely involute; 

 pulvilli none or faintly developed. 



Awns longer than the membranous lemmas; 

 blades soft, sulcate; ovary hispidulous at 

 apex. 

 Awns not longer than the coriaceous lemmas; 

 ovary glabrous. 



JUades variouSj but when hard the 



lemma awned. 

 Blades smooth, firm, rigid; lemma awn- 

 less. 

 Tufts separable Avith difBculty; blades narrow, 

 loosely involute or flat; lemma thin; a pulvil- 

 lus at the base of each ray. 

 Lemma smooth, usually awnless, sometimes 



awn-pointed. 

 Lennna scabrous-puberulent, short-awned. 

 Blades at length falling away from the persisting sheaths; 

 palea notched at apex. 



Panicle rays spreadhig; spikelets shining; culm and 

 loosely involute green blades smooth or nearly so. 19. altaica. 



Panicle rays erect or becoming so; spikelets dull; 

 culm and closely involute glaucescent blades nsu- 



16. rigescens 



17. viridala 



18. hovjeUii. 



ally very scabrous. 



20. kallii 



Ligule short, ciliate; collar and auricles tomentose or bristly. 21. aristulata. 

 Ligule 4 to 9 mm. long, s{*arious. 22. thnrheri 



