MANUAL OF THE GEASSES OF THE UNITED STATES 



109 



2.5 mm long, broad, glabrous, not webbed at base, the nerves faint. 

 <2i — Known only from Bear Valley, San Bernardino Mountains, 

 Calif. 



13. Poa curta Rydb. (Fig. 176.) Culms few in a loose tuft, 40 to 

 80 cm tall, rather lax; sheaths glabrous or minutely roughened; ligule 

 truncate, about 1 mm long; blades 3 to 6 mm wide; panicle open, 5 to 

 15 cm long, nodding, the rather distant branches spreading or reflexed, 



Figure 173.— Poa confinis. Plant, X 1; floret, X 10. 

 (Piper 4910, Wash.) 



Figure 174. — Poa rhizomata. Plant, X 1; 

 floret, X 10. (Type.) 



naked below; spikelets 5 to 10 mm long, 2- to 6-flowered; lemmas lan- 

 ceolate, subacute, slightly scaberulous, sometimes slightly pubescent 

 on the back at base, without a web, 4 to 5.5 mm long, rather strongly 

 nerved or intermediate nerves faint. % — Moist shady places at 

 medium altitudes, western Wyoming, southern Idaho, and Utah. 



14. Poa nervosa (Hook.) Vasey. Wheeler bluegrass. (Fig. 

 177.) Culms erect, 30 to 60 cm tall; sheaths glabrous or the lower 



