No. 34. 

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



Plant perennial, loosely tufted, with short rootstocks and abundant slender 

 fibrous roots. 



Culms erect or somewhat geniculate below, slender, smooth, naked above, 6 to 10 

 inches high. 



Leaves from the base abundant, flat or involute, 1 to 3 inches long. Leaves of 

 culm usually 2 ; sheaths close, smooth, shorter than the internodes, blades flat or in- 

 volute, nearly smooth, £ line wide, 1 to 2 inches long; ligule obtuse, nearly 1 line long. 



Inflorescence an open pyramidal panicle, 2 to 3 inches long, usually purple through- 

 out; common axis scabrous toward the extremity, slightly flexuous; rays in threes or 

 fives below, in twos or single above, slender, scabrous, flexuous, at length spreading, 

 1£ inches long or less, divided and spikelet-bearing beyond the middle. 



Spikelets on pedicels about equaling themselves, obovate, less than 1 line long; 

 empty glumes rather unequal (second shorter and broader), ovate-lanceolate, acute, 

 convex, smooth or first slightly scabrous on the keel above, less than 1 line long; 

 floral glume oblong, obtuse, hyaline, smooth, obscurely 5-nerved, £ line long; palet 

 wanting; grain oblong, thicker below, dull yellow, £ line long. 



Plate XXXIV; a, spikelet enlarged 15 times; b, empty glumes; c, floral glume, 

 dorsal view ; d, floral glume, side view. 



Southern California and perhaps extending with varying forms to Washington. 



