55 



1. D. Fischeri, H. Br. Arctic coast to Hudson's Bay. 



2. D. philosantha, Hupt. Arctic coast to Hudson's Bay. 



Gbaphephoeum, Desv. 



Spikelets two to three flowered, with a minute sterile pedicel, in a 

 narrow loose panicle ; outer glumes unequal, membranaceous, com- 

 pressed, acute; the upper one about equalling the spikelet, broad above 

 the middle, the lower one shorter and narrower, one-nerved ; flowering 

 glumes lanceolate, membranaceous with a scatious margin, com- 

 pressed, 3 to 5 nerved, acute or obtusish or slightly emarginate and 

 sometimes mucronate ; palet narrow, as long as the glume, two-nerved ; 

 the flowers surrounded at the base with a ring of soft hairs, and the 

 rhac.his also more or less hairy. 



1. G. melicoides, Beauv. New England and Canada. 

 G. meliciodes, var. major, Gray. Michigan. 



2. G. Wolfii, Vasey. (Trisetnm subspicatum, var. muticnm, Thurb.) 



Rocky Mountains to Oregon, California, and Montana. 



3.? G. flexuosnm, Thurb. Plains and Rocky Mountains. 



This is provisionally placed here, but does not agree with the 

 characters of the genus. 



Teisbtdm, Pers. 



Spikelets two to three, rarely five-flowered, in a dense or open 

 panicle, the rhachis usually hairy and produced into a bristle at the 

 base of the upper flower; outer glumes unequal, acute, keeled, mem- 

 branaceous, with scarious margins; flowering glumes of similar 

 texture, keeled, acute, the apex two-toothed, the teeth sometimes 

 prolonged into bristle-like points, the middle nerve furnished with 

 an awn attached above the middle, which is usually twisted at the 

 base and bent in the middle ; palet hyaline, narrow, two-nerved, 

 two- toothed. 



1. T. barbatnm, Steud. California and Oregon. 



2. T. canescens, Buckley. California and Oregon. 



3. T. cernunm, Trin. California and Oregon. 



These Pacific coast species deserve further attention with refer- 

 ence to their agricultural value. 



4. T. Hallii, Scrib. Texas. 



