No. 32. 

 AGROSTIS HALLII Vasey, Contr. Nat, Herb. iii. 74. 



Plant perennial, from thick tufts of roots. 



Culms erect, simple, smooth, stout, at length naked above, 2 to 3 feet high. 



Leaves from the base numerous, mostly involute. Leaves of the culm 3 to 5; 

 sheaths slightly roughened, close, usually crowded below, middle and upper ones 

 shorter than internodes; blades flat, hispid on both sides, erect, 1 to 2 lines wide, 3 

 to 6 inches long; ligule membranaceous, acute, decurrent, 2 lines long. 



Inflo rescence a rather closely-flowered, narrow, erect panicle to 9 inches long; 

 common axis slender, straight, smooth, and shining or hispidulous toward the extrem- 

 ity; rays in clusters of 5 to many, semiverticillate at the 6 to 9 rather distant nodes, 

 slender, scabrous, erect or slightly spreading, unequal, the longest 1 to 4 inches long, 

 bearing beyond the middle rather crowded, pedicellate spikelets. 



Spikelets lanceolate, turgid, 1 -flowered, 1 to 1^ lines long; empty glumes persistent, 

 lanceolate, acute, convex, usually purple, hispid on the keel, 1 -nerved, subequal (second 

 slightly shorter), 1 to lj lines long; floral glume oblong, obtuse, thin, smooth, except 

 2 tufts of short hairs at the base, 5-nerved, § line long; palet wanting; grain oblong, 

 tapering toward the apex, yellow, opaque, falling with the floral glume, 



Plate XXXII; a, spikelet enlarged about 12 times; ft, empty glumes ; c, floral 

 glume, dorsal view; d, floral glumes, stamens and pistil. 



California, Oregon, and Washington. Probably a valuable meadow grass. 



