MANUAL OF THE GRASSES OF THE UNITED STATES 



133 



south to Nevada (Mount Rose) and 

 California. 



Figure 171. — Poa pringlei. 

 Plant, X 1; floret, X 10. 

 (Henderson 3080, Idaho.) 



59. Poa lettermani Vasey. (Fig. 

 172.) In low lax tufts; culms mostly 

 less than 10 cm. tall, usually scarcely 

 exceeding the blades; ligule 1 to 2 

 mm. long; blades lax, usually not 

 more than 1 mm. wide; panicle nar- 

 row, contracted, 1 to 3 cm. long; 

 spikelets 3- or 4-flowered, 4 to 5 

 mm. long ; glumes equal, somewhat 



acuminate, about as long as the first 

 and second florets; lemmas erose at 

 summit, 2.5 to 3 mm. long. % — 

 Rocky alpine summits, British Co- 

 lumbia, Washington, Wyoming, and 

 Colorado to California. 



60. Poa montevansi Kelso. (Fig. 

 173.) Similar to P. lettermani, the 

 culms (in type specimen) only 4.5 

 cm. tall, differing chiefly in the spike- 

 lets, with scabrous glumes and lem- 

 mas, the lemmas more acute and 

 scarcely erose. % — Known only 

 from Mount Evans, 14,260 feet alti- 

 tude, Colo. 



Figure 173. — Poa montevansi. Plant, X 1; spikelet 

 and floret, X 10. (Type.) 



61. Poa leibergii Scribn. Leiberg 

 bluegrass. (Fig. 174.) Usually dense- 

 ly tufted; culms 5 to 30 cm. tall, 

 erect; ligule 1 to 2 mm. long; blades 



Figure 172. — Poa letter- 

 mani. Plant, X 1; floret, 

 X 10. (Letterman, Colo.) 



Figure 174.— Poa leibergii. Plant, X 1; floret, X 10 

 (Type.) 



mostly basal, firm, involute, usually 

 less than 10 cm. long; panicle narrow, 



