FESTUCE.E. 533 



5. P. subaristata Scribn. Macoun Cat. Can. PI. 4:337 (1888). 

 No descriptiou. 



A slender densely tufted perennial, 30-40 em. high. Blades 

 of sterile shoots eonduplicate, scabrid, 5-10 cm. long. 0.5-1 mm. 

 diam., sheaths of culm 3, smooth, the upper extending to near the 

 middle of the whole height; ligule 1 mm. long; upper blade pun- 

 gent, 0.5-3 cm. long. Panicle linear to oval, dense, somewhat 

 intorrui)ted, 3-6 cm. long, more or loss tinged with purple. 

 Spikelets linear-lanceolate, 4-T-flowev< 1, G-9 mm. long; empty 

 glumes subequal, liaear-lanceolate, 5 mm. long, one-nerved; floral 

 glume 6 mm. long, scabrid on tlie nerves, not webbod, linear- 

 lanceolate; i)alea narrowly linear before spreading, 5 mm. long, 

 ciliolate on the keels. 



Yellowstone Park, F. Ttveedii G:}3. 



G. P. Cusickii Vasey, Contrib. V. S. Nat. Herb. 1:371 (1893). 



A glabrous tufted perennial, 30—40 cm. high. Sterile shoots 

 numerous, blades coiuluplicate or involute-tiliform. 10-15 cm. long, 

 0.3 mm. diam, ; leaves of the culm 3, the lower sheatlis longer than 

 their internodes; ligule decurrent, 3-3 mm. long, blades flat or 

 involute, acute, 3.5-5 cm. long, 1.5 mm. wide. Panicle more or 

 less exserted, narrow, G-10 cm, long, rays mostly in twos, tlie 

 longest 3-4.5 cm, long, bearing 4-8 spikelets on tlie outer half. 

 Spikelets narrowly to broadly ovul. G.7 mm. long, 3-3-flowered, 

 rachilla hispidulous, empty glumes with broiul chartaceo-liyaline 

 margins, first ovate-lanceolate when spread, 3.5 mm. long, 1-nerved, 

 rarely 3-nerved; second oval, erosely acute, 4-4.5 mm. long, 

 3-nerved; floral glume keeled, 4.3-5 mm. long, scal)rous, oval 

 when spread, subacute; palea 4.4 mm. long, 3-toothed, ciliate on 

 the keels. 



Oregon, Cusirk for V. S. Dei)t. Agricul, 1310. 



7. P. aatumnalis Muhl.; Kll. Hot. S. ('. cS: (in. 1:159 (1817). 



P. Jh'xmsa Mnhl. (iram. 148 (1S17), not .1. K. Smith. P. 



piingens Torr. Fl. U. S. 1: 10!) (1834), not Xutt. (1818). /'. 



Canipyh Schult. Mant. 3:304(1834). P F/Iiof.'ii ^[new^. Syst. 



1:338 (1834). 



A soft slender smooth tufted perennial, 3()-S() cm. high; 



