n48 POACE^. 



em. long, rays smooth, in pairs, the longest 1.5-3 cm. long, densely 

 ilower-beariug above the middle. Spikelets oval, 4-G mm. long, 

 :{-5-ilowered, softly scabrid; empty glumes lance-ovate, acute, 3- 

 nerved, second 3.5-4.3 mm. long, reaching three-fourths to four- 

 fifths over the glume above; floral glume Avith a few webby hairs at 

 the base. 3-3.7 mm. long, involute, broadly ovate, abruptly acute; 

 palea linear-lanceolate, ciliate on the keels. 



Oregon, Howell in July 1882. and in 1887. 



Some of tliese liavc been distributed as P. ahh rev lata W. Br., 

 but Dr. Vasey had an opportunity for comparison and I follow him 

 in the selection of name. 



Oregon to the Aretic Coast. 



30. P. Grayana Vasey, Contrib. ^5. S. Xat. Herb. 1:2T2 

 (1892). 



Kootstocks and sterile shoots numerous; culms 30-50 cm. high. 

 Blades of sterile shoots conduplicate, abruptly pointed, 15-20 cm. 

 long, 2 mm. wide; leaves of the culm 2 in number; liguledecurrent, 

 2-1 mm. long; upper blade 4-G cm. long. Panicle open, 8-12 cm. 

 long, rays in pairs, the longest 4-6 cm. long, bearing 3-G spikelets 

 on the outer third. Spikelets tinged with purj)le, the margins of 

 the ghunes broAvn, Q-'ii mm. long, 3-5-ilowered; empty glumes oval, 

 subacute, 3-iierved, first about 3.5 mm. long, second 4-4.5 mm. 

 long; lloral glume pubescent on tiie keel and marginal nerves of the 

 lower two-fifths, 3.5-T mm. long, ovate, obtuse, erose; palea but 

 little shorter than its glume, linear when closed, ciliate on the keels. 



Colorado, Patterson 14 in 1885. 



High Mountains about Gray's Peak; altitude 10,000-12,000 feet. 



In herb. Y. S. Dei)t. Agricul. 



31. P. Thurberiana (Kuntze) Vasey(?) 



An erect light-green rather slender perennial, 50-80 cm. high, 

 culms aiul leaves smooth or scabrid. Sterile shoots few, the blades 

 20-40 cm. long, leaves of the culm 4-5, sheaths mostly longer than 

 the internodes, smooth; ligule truncate, lacerate, 4 mm. long; 

 blades mostly flat, acuminate, 2 mm. wide, the upper extending to 

 tlie base of the panicle or beyond. Panicle narrow, thin, 15-25 

 cm. long, rays iu threes and fours, some of them very siiort, the 



