314 POACE.E. 



wide. I'aniclo much exserted, erect or nodding, interrupted, 

 15-30 cm. long, pedicels scabrous, clavate, -1-0 mm. long. 

 Spikelets linear-lanceolate, acute, 3—4 mm. long; emi)ty glumes 

 linear -lanceolate, awn -pointed, .scabrous on the back, 1-nerved; 

 lloral glume thin, broad, truncate. 4-5-toothed, 4-5-nerved, with a 

 straight awn on the back above the middle l-'Z mm. long; palea 

 about half as long as its glume. 



Southern California ; by streams of Santa IJita Mountains in 

 Arizona; ^Mexico. 



Karely met with by ]\Ir. Pringle, and then only in damp 

 shaded ledges. 



•4. P. iJTTOULis Sm. Comp. Fl. Brit. Ed. J>, 13 (1816). Bot. 

 Calif. 3:270 (1880). 



A tufted })ereniiial, 30-60 cm. high, ascending from rootstocks. 

 Sheaths nearly as long as the internodes; the upjier slightly in- 

 llated; ligule acute, 4-5 mm. long; blades flat, narrow, scabrid. 

 ]*anicle usually exserted, much lobed, often tinged with purple, 

 5-12 cm. long. Spikelets narrow, pointed, 2-2. '7 mm. long, S(!a- 

 brid, the awns as long as the ejni)ty glumes, which are elliptical 

 when spread, appearing acute as tlie apex is involute; floret 1 nnn, 

 long, bearing an exserted awn nearly twice its length ; floral glume 

 broadly truncate, jagged, hyaline; palea 2-toothed. 



Oregon, IloiceU for U. S. Dept. Agricul. 414; California, 

 JoneK 2352, Prinf/le. 



Apparently introduced in wet places. 



Texas to Oregon and Calfornia. 



03. (48). ThurbeKIA Benth. Journ. Linn. Soc. 19: 58 (1881). 

 (h-eenia Nutt. Trans. Am. Phil. Soc. 5:142 (1837), not Walk. 

 »S: Arn. Srlerarhne 'I'orr. Trin. Mem. Acad. St. Petersb. (\'I) 

 0:273 (1845). 



Spikelets 1 -flowered, narrow, in slender panicles, pedicel articu- 

 late. Glumes 3, empty, subequal, awnless, nerves obscure, the 

 floral glume a little shorter, slender, usually torn so as to api)ear 

 bifid, a long slender geniculate awn a little below the point; palea 

 a little shorter, narrow, hyaline, 2-keeled. Lodiculcs 2, longer 

 than the short anthers. Stamens 3. Styles ehort, distinct, stig- 



