No, 48. 

 TRISETUM CERNUUM Tiin. SU-m. Acad. St.-Peter.s. 1830. i. 61. 



Pte7i< perennial, loosely tufted, sonicwliat tliickcncd at hasc. 



Culms erect, smooth, 2 to 3 feet high. 



Lefires of cnlni usually throe; sheaths rather loose, open above, striate, smooth or 

 scabrid al)ove or eveu caiiesceut, shorter than tlie iiiteniodes; blades flat, scabrid on 

 both sides or nearly smooth beneath, 5 to 10 iiiclieK Innj;, .'5 to (I lines wide; lijiule ovate, 

 lacerate, 1 to lines louff. 



Iii/h) reticence a rather loose, o])en, tlexuose or iioddiiiji panicle 5 to 8 inches long; 

 rays in twos, threes, or ftmrs at the 7 to 10 nodes of the scabrid connnon axis, slender, 

 tlexuose, spreading, scabrid, bearing beyond the nnddle spikelets on ix'dieels 1 to 5 

 lines long. 



Spikelets compressed, 2-, 3-, or rarely 4 tlowered, 3 to 4 lines long ; first emi)ty glume 

 narrowly ovate, acute, carinate, thin, minutely hispid on the keel, Inerved, 1 to li 

 lines long; second empty glume broadly oblong, obtuse or acuminate, thin, hispid on 

 the keel above, 3-nerved below, 2 to 2| lines long; awn arising below the base of the 

 cleft, 3 to 5 lines long; hairs of the callus short; internode of the rachilla villose, 1 

 line long, up])er one bearing a slender awni about one line long; palet oblong, erose at 

 the olttuse apex, slightly arched, thin, minutely scabrid, hisjiidulous on the two keels, 

 li lines long; grain narrowly oblong, light yellow, oi)aque, \.\ lines limg. 



Plate XLVIII; «, spikelet enlarged (i times; b, em])ty glumes; c, floral glume, 

 side view; d, palet, dorsal view; c, palet aud internode of rachilla, side view. 



Northern California to Alaska. 



