138 FESTUCEAE 



Splkelets decidedly flattened; flowering 

 glumes acute; nerves of the flowering 

 glumes villous but the Internervea 

 glabrous; plants dioecious. 

 Llgules long, 5 to 7 mm., acute or acum- .,. , 



inate. 13. P. longiUgula. 



Llgules short, rounded or truncate at the 

 apex. 

 Panicle very narrow and long peduncled, . 



contracted. !*• P- longtpedunculata. 



Panicle more open, at least when in 

 flower. 

 Panicle very short; plant low; leaves 



smooth below, scabrous above. 15. P. brevipamculata. 



Panicle longer, 3 to 6 inches; plants 1 

 to 2 feet high. 

 Empty glumes nearly equal, 3-nerv- 

 ed; leaves smooth below, scab- 

 rous above. 16- P- arida. 

 Empty glumes unequal, the first 1- 

 nerved the second 3-nerved; 

 leaves scabrous below hispld- 

 puberulent above. 17- P- fendleriana. 



1. Poa annua L. A fairly common annual in the Transi- 

 tion Zone in the northern part of the State. 



2. Poa bigelovii v. and S. A common annual in the 

 mountains throuuluuit tlie State in the Transition Zone and oc- 

 casionally in the Upper Sonoran. 



3. Poa pratensis L. Blue Grass. Not uncommon as an 



escape in the niountaius in the Transition and Canadian Zones. 

 Often cultivated at the higher levels as a lawn grass. 



4. Poa arctica li. r.r. in the Arctic-alpine Zone, on high 

 peaks in the northern jiart of the State. 



5. Poa reflexa v. and S. Known in New Mexico from a 

 single collection Ijy Feiidlcr (No. 929), probably from near Santa 

 Fe though not certainly. May not be New Mexican. 



6. Poa OCCiclentalis Vnsey. One of the commonest of the 

 Poas in llie coo'er titnl)i'red mountains at middle and higher ele- 

 vations in the Transition Zone extending into the Canadian. 



7. Poa tracyi Vasey. Known only from ^he type locality 

 near Raton. It may not be a valid species. 



8. Poa COmpressa L. A rare species from the high 

 mountains at the northern end of the State in tl^e Canadian Zone. 



