No. 33. 



AGROSTIS HUMILIS Vasey, Bull. Torr. Club, x. 21. 



Plant perennial, iu small dense tufts, from a short rootstock or tufts of fme roots. 



Culms erect, sleuder, smooth, naked above, 4 to 8 inches high. 



Leaves from the base numerous, narrow, smooth, mostly erect, not rigid, 1 to 3 

 inches long. Leaves of culm usually but one; sheath close, smooth, about ^ as long 

 as the culm; blade flat, erect, § line wide, £ to 2 inches long; ligule auriculate or 

 3-lobed, £ line long. 



Inflorescence a narrow, rather few-flowered, erect panicle, 1 to 1£ inches long; rays 

 mostly in twos or threes below, twos or single above, erect or slightly spreading, spikelet- 

 bearing beyond the middle. 



Spikelets lanceolate, turgid, 1 flowered, nearly 1 line long; empty glumes equal, 

 persistent, ovate-lanceolate, acute, convex, smooth, purple, 1-nerved, f to 1 line long; 

 floral glume ovate-oblong, minutely toothed at the obtuse apex, thin, smooth, purple, 

 or rarely green, 5-nerved, § line long; palet ovate-obloug, thin, smooth, 2-nerved, £ 

 line long; grain spindle-shaped, equally acute at each end, £ line long. 



Plate XXXIII; 1, 2, and 3, plants natural size; a, spikelet enlarged 10 times; 

 />, empty glumes; c, floral glume, dorsal view; d, palet rolled about the grain. 



Oregon and Washington; wet soil. 



