GRASS FAMILY 



205 



20. Poa rupicola Nash. 

 Tiniberline Bluegrass. Fig. 472. 



Poa riipestris Vasey, Bull. Torrey Club 14: 94. 1887, not 



Roth 1821. 

 Poa rupicola Nash in Rydb. Mem. N. Y. Bot. Card. 1 : 49. 



1900. 



Perennial ; culms tufted, erect, rather stiff, smooth. 

 10-20 cm. tall ; sheaths smooth ; ligule about 1 mm. 

 long : blades -erect, flat or involute, smooth. 1-5 cm. 

 long. .5-1 mm. wide; panicle narrow, purplish, 2-4 

 cm. long, the branches ascending or appressed, the 

 lower as much as 1 cm. long ; spikelets 5 mm. long, 

 about 3-flowered ; lemmas 3-4 mm. long, villous be- 

 low on the keel and marginal nerves, the intermediate 

 nerves indistinct, no web at base. 



Rocky slopes in the Arctic Zone; Oregon (Wallowa Moun- 

 tains, Cusick), California (Mono Pass, Eastwood), and in the 

 Rocky Mountains from Montana to Colorado. August. Type 

 locality: Rocky Mountains, no definite locality. 



21. Poa pachypholis Piper. 

 Seacliff Bluegrass. Fig. 473. 



Poa pachypholis Piper, Proc. Biol. Soc. Washington 18: 146. 

 1905. 



Perennial, without rhizomes ; culms densely tufted, 

 wholly glabrous below the panicles, 15-30 cm. tall: 

 basal leaves numerous, the sheaths long-persisting: 

 ligule 2 mm. long ; blades erect, pale or glaucous, flat 

 or loosely involute, 4-10 cm. long, 1-2 mm. wide, the 

 culm leaves usually 3 ; panicle dense, oblong, 2-5 cm. long, 

 the lower branches mostly in twos ; spikelets 3-5-flowered, 

 pale ; lemmas 4 mm. long, villous on the keel and lateral 

 nerves, no web at base. 



Only known from the type collection from ocean cliffs at 

 Ilwaco, Washington. June. 



22. Poa longiligula Scribn. & \\'illiams. 

 Long-liguled Mutton-grass. Fig. 474. 



Poa longiligula Scribn. & Williams, U. S. Dept. Agr. Div. 

 Agrost. Circ. 9: 3. 1899. 



Tufted perennial, similar to P. fcndleriana ; culms 

 smooth, 30-60 cm. tall ; sheaths and blades smooth ; 

 ligule 5-7 mm. long, or on the innovations some- 

 what shorter ; panicle looser and often longer ; 

 spikelets as in P. fendlcriana. 



Caiions and dry mountain slojies, Oregon (Stein's Moun- 

 tain), California (San Bernardino Mountains), east to Mon- 

 tana and New Mexico. June. Tvpe locality: Silver Reef, 

 Utah. 



