250 



POACEAE 



6. Elymus flavescens Scribn. & Smith. 

 Yellow Rye-grass. Fig". 594. 



Elvmiis flavescens Scribn. & Smith, U. S. Dept. Agr. Div. 

 "Agrost. Bull. 8: 8. /". 1. 1897. 



Perennial with creeping rhizomes ; culms erect, 

 smooth, 50-100 cm. tall ; sheaths smooth ; blades 

 firm, glabrous beneath, scabrous above, 2-5 mm. 

 wide; spike 10-25 cm. long, sometimes branching; 

 spikelets 2-3 cm. long, approximate or somewhat 

 distant ; glumes very narrow or subulate, 1-1.5 cm. 

 long; lemmas densely silky villous, the hairs long, 

 yellowish or brownish. 



Sand dunes, in the Upper Sonoran Zone; eastern Wash- 

 ington, Oregon, and east to Idaho. June-July. Tj'pe lo- 

 cality: Columbus, Washington. 



7. Elymus cinereus Scribn. & Merr. 

 Gray Rye-grass. Fig. 595. 



Elvmus cinereus Scribn. & Merr. Bull. Torrey Club 29; 467. 

 "1902. 



Culms erect, stout, puberulent, 1-3 meters tall ; 

 sheaths and blades cinereus-pubescent, the latter 

 with an indurate point; spike erect, 15-20 cm. long, 

 dense, interrupted below; spikelets 1.5-2 cm. long; 

 glumes subulate, about 12 mm. long, scabrous-pubes- 

 cent ; lemmas scabrous-pubescent, especially the apex, 

 faintly nerved, obtuse, mucronate or with a short 

 awn-point. 



Meadows and hills, in the Arid Transition Zone; southern 

 California (San Bernardino, Parish; Lone Pine, Jepson; 

 Lancaster, Elmer; without locality, Davy) and Nevada. 

 June-July. Type locality; Pahrump Valley, Nevada. 



8. Elymus condensatus Presl. 

 Giant Rye-grass. Fig. 596. 



Elymits condensatus Presl, Rel. Haenk. 1; 265. 1830. 



Culms in large tufts, stout, 1-3 meters tall, producing 

 stout knotty rhizomes; sheaths smooth; blades flat, as 

 much as 2 cm. wide; spike erect, usually dense, as 

 much as 30 cm. long, sometimes branched ; glumes 

 narrowly lanceolate or subulate, awn-pointed, usuall}' 

 only 1-nerved, or nerveless, about as long as the first 

 lemma ; lemma awnless or mucronate. 



Dry plains and hillsides and along gullies and ditches, in the 

 Arid Transition and Upper Sonoran Zones; British Columbia 

 to southern California, east to Nebraska. June-Aug. Type lo- 

 cality; Monterey, California. 



Elymus condensatus pubens Piper, Erythea 7; 101. 1899. 

 Sheaths and blades pubescent. Yakima City, Washington, the 

 type locality, and Santa Barbara (Hitchcock). 



