314 POACE^. 



wide. Panicle much exserted, erect or nodding, interrnpted^ 

 15-30 cm. long, pedicels scabrous, clavate, 4-6 mm. long. 

 Spikelets linear-lanceolate, acute, 3-4 mm. long; empty glumes 

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

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

 straight awn on the back above the middle 1-2 mm. long; palea 

 about half as long as its glume. 



Southern California ; by streams of Santa Eita Mountains in 

 Arizona; Mexico. 



Rarely met witli by Mr. Pringle, and then only in damp 

 shaded ledges. 



4. P. LiTTOKLis Sm. Comp. Fl. Brit. Ed. 2, 13 (1816). Bot. 

 Calif. 2:270 (1880). 



A tufted perennial, 30-60 cm. liigh, ascending from rootstocks. 

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

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

 Panicle usually exserted, much lobed, often tinged with purple, 

 5-12 cm. long. Spikelets narrow, pointed, 2-2.7 mm. long, sca- 

 brid, the awns as long as the empty glumes, which are elliptical 

 when spread, appearing acute as the apex is involute; floret 1 mm. 

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

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



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

 Jones 2352, Pringle. 



Apparently introduced in wet places, 



Texas to Oregon and Calfornia. 



63. (48). Thurberia Benth. Journ. Linn. Soc. 19:58 (1881). 

 Greenia Nutt. Trans. Am. Pliil. Soc. 5:142 (1837), not Walk. 

 & Am. Sderachne Torr. Trin. Mem. Acad. St. Petersb. (VI) 

 6:273(1845). 



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

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

 floral glume a little sliorter, slender, usually torn so as to appear 

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

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

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



