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



1 to 4 cm. long; spikelets 2- or 3-fiow- 

 ered, 5 to 6 mm. long; lemmas about 

 4 mm. long, strongly pubescent on the 

 keel and marginal nerves, short- 

 pubescent on the internerves, some- 

 times sparsely webbed at base. % 

 — Alpine regions, Montana to Oregon 

 (Mount Hood), Colorado, and Utah. 

 51. Poa rupicola Nash. Timber- 

 line bluegrass. (Fig. 164.) Culms 

 densely tufted, erect, rather stiff, 

 often scaberulous below the panicle, 

 10 to 20 cm. tall; blades short, 1 to 

 wide; panicle narrow, pur- 

 to 4 cm. long, the short 

 ascending or appressed ; 

 usually purple, about 3- 

 lemmas villous below on 



Figure 164. — Poa rupicola. 

 Plant, X 1; floret, X 10. 

 (Swallen 1348, Colo.) 



1.5 mm. 



plish, 2 



branches 



spikelets 



flowered ; 



keel and marginal nerves and some- 



Figure 165.— Poa involuta. Plant, X 1; floret, X 10 . (Swallen 1110, Tex.) 



