644 POACE^. 



blades of sterile shoots flat, or oftener more or less conduplicate, 

 very abruptly concave-pointed, 5-30 cm. long, tliose of tbe culm 

 3, smooth or scabrous, tlie upper one sborter than its slieatb, usu- 

 ally 6-10 cm. long, 2-2.5, rarely 4-7 mm. wide. Panicle ratbor 

 close or open pyramidal, tbe diameter of the base about tbe 

 same as the length, 1-19 (mostly about 10) cm. long, rays scabrous 

 or smootli in half-wborls of 3-6, the longest 3-11 cm. long, ratber 

 densely flower-bearing on the upper half. Spikelets often tinged 

 with purple, many with pedicels 1 mm. or less in lengtb, oval, 

 ovate, ovate-lanceolate, 3-6-flowered, 4-7 mm. long, joint of 

 rachilla 0.5 mm. long; empty glumes acute, ,',cabrous on tbe keels,, 

 first 2.5-3 mm. long, 1- (rarely 3-)nerved, ovate-lanceolate, second 

 3-3.5 nmi, long, 3-ncrved, oval-lanceolate; floral glume tbickly 

 wel)l)ed at the base, pubescent on tbe marginal nerves and on tbe 

 lower two-thirds of tbe keel, 3-4 mm. long, oval, subacute wlu-n 

 spread, the apex scabrous for 0.5 mm. or less; palea linear, 2.5-3 

 mm. long, scabrous on tbe keels. Antbers 1.5 mm. long. 



Variety angnsti folia is a nameapi)lied to forms witb mirrow radi- 

 cal leaves, but is scarcely a variety. A very valuable ])asture-gniss. 

 See Vol. I. p. 133, Fig. 51. Nearly allied to P. trlvialis L., under 

 wbicb see note. 



Pennsvlvania, V. S. Dejit. AffririiJ. (iG2 from Scribner; ^Um- 

 tana, Ctinhy tP Scrihnvi' 303; Yellowstoiu' Park, Frank Tircodij 

 277. 04(5; Oregon, /foirelL tbe indigenous form. Several forni.s 

 cultivated at Agricultural College, Micbigan. 



Common throughout Europe, central and Russian Asia, also 

 North Ami'rica and in the Southern IIemisi)bere. 



24. P. Brandegei Scribn. 



An alpiiu^ annual (?) 2-4 cm. bigb. Ligule truncate, 1 mm. 

 long; blades tbiu, flat or conduplicate, 1-3 em. long, 0.5-1 mm. 

 wiole. Panicle sparingly branched, 0,5-1 ctn. long. Spikeleti 

 purplish, broadly oval, 3-4 mm. long, ;}-4-flowered, joint ot rachilla 

 0.5-0.7 mm. long; empty glumes tbin, 3-nerved, second oval, 

 acute or obtuse. 2.7-3.1 mm. long; floral glume not webbed not- 

 pubescent, about 2 mm. long, very broadly oval, erose, tbin. ob- 

 scurely 5-nerved; palea linear, incurved, smootb, nearly 2 mm. 



