118 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



27. Poa saltuensis Fern, and Wieg. 

 (Fig. 141.) Resembling P. languida; 

 differing in the thinner, acute, some- 

 what longer lemmas. % — Wood- 

 land thickets, Quebec and New- 

 foundland to Minnesota, south to 

 Connecticut and Virginia. 



28. Poa occidentals Vasey. New 

 Mexican bluegrass. (Fig. 142.) 

 Culms erect, few in a tuft, usually 

 rather stout, scabrous, as much as 

 1 to 1.5 m. tall; sheaths somewhat 

 keeled, retrorsely scabrous (some- 

 times faintly so); ligule 2 to 8 mm. 

 long; blades scabrous, 10 to 20 cm. 

 long, 3 to 6 mm. wide; panicle open, 

 15 to 30 cm. long, the branches in 

 distant whorls of threes to fives, 

 spreading to reflexed, the lower as 

 much as 10 cm. long, spikelet-bearing 

 toward the ends; spikelets 3- to 6- 

 flowered; lemmas 4.5 to 5 mm. long, 

 conspicuously webbed at base, villous 

 on the lower part of the keel and the 

 marginal nerves and sometimes spar- 

 ingly pubescent on the internerves 

 below. % — Open woods and moist 

 banks at medium altitudes, Wyoming 

 to New Mexico. 



29. Poa tracyi Vasey. (Fig. 143.) 

 Culms erect, 60 to 80 cm. tall; 

 sheaths glabrous, keeled; ligule trun- 

 cate, about 2 mm. long; blades 3 to 

 5 mm. wide; panicle narrowly pyram- 



Figure 138. — Poa marcida. Panicle, X 1 ; floret, X 10. 

 (Type.) 



Figure 139. — Poa alsodes. Panicle, X 1; floret, X 10. (Wilson, N. Y.) 



