FESTUCEiE. 579 



taceous appearance, apparently dioBcious, the staminate plant tlie 

 more slender, with more acute florets. 



California, Pringle in 1882. 



Mountains about tlie head-waters of the Sacramento River. 



12. A. Lettermani (Vasey). Pan Lettermani Vasey, Contrib. 

 XJ. S. Nat. Herb. 1:273 (1893). 



A dwarf tufted perennial, 4-10 cm. liigh. Siieatlis loose; upper 

 ligule 3 mm. long acute, laciniate; blades conduplicate, 1-2.5 cm. 

 long, 1.5 mm. wide, abruptly pointed. Panicle linear, 1-2.5 cm. 

 long, rays in pairs or single. Spikelets tiuged with purple and 

 brown, oval, 3-3.5 mm. long, 2-4-flowered, empty glumes subequal, 

 extending nearly to the tip of the upper floret, ellijitical-lanceolate, 

 3-nerved; floral glume 2-2.5 mm. long, minutely scabrid, broadly 

 oval when spread, denticulate ; paleu but little sliorter tlian its glume. 



Colorado (Gray's Peak), Letterman in 1885, Jones. Collected 

 12,500 feet altitude on tlie mountains. 



13. A. pauciflora Thurb. S.Wats. Bot. Calif. 2: 310 (1880). 

 Poa pauciflora Benth. Vasey, Cat. Grass. U. S. 42 (1885). 



A pale-green tufted perennial, 60-75 cm. high. Blades of 

 sterile shoots about 30 cm. long, 2-3 mm. wide, conduplicate, sca- 

 brous, pungent-pointed, leaves of the culm 2-3 in number; ligule 

 3-4 mm. long, wider than the blades, tlie upper blade 3-7 cm. long, 

 3-4 mm. wide. Panicle 12-30 cm. long, linear, rather thin, inter- 

 rupted below, rays mostly in twos and threes, 3-7 mm. long, 

 branching, flower-bearing to near the base. Spikelets 1-2-flowered; 

 sometimes with a rudiment of a third; empty glumes subequal, 

 smooth, first 3-nerved, 3-3.5 mm. long; floral glume 3 mm. long, 

 scabrid, oval; palea as long as its glume. 



California, Pohnuh'r, growing in wet meadows. 



14. A. tenuifolia Thurb. S. Wats. Bot. Calif. 2: 310 (1880). 

 Poa tenuifolia Buckl. in Proc. Acad. Sci. 96 (1863), not Rich. 

 (1851). Poa Sheldo ni Viisey, Contrib. U. S. Nat. Herb. 1:276 

 (1893). 



A strict slender tufted perennial, 40-60 cm. high, usually gla- 

 brous and tinged with brown or pink. Ligule acute, 3-4 cm. long; 

 blades conduplicate, those of the sterile shoots 5-15 mm. long, 1-2 



