654 POACEiE. 



nearly the same height, the third raised 2 mm. or more. In one case 

 a 10-nerved glume with 2 awns covered 2 paleae and the stamens 

 and pistil ; palea obtuse or retuse, equal to its glume. This resem- 

 bles Agropyron in having some single spikelets, Hordeum in having 

 a small spikelet raised on a pedicel, and Elymus in other particulars. 



Colorado, Fase^inl884; Montana, Anderson od; British Amer- 

 ica, Macoun (4500 ft. alt.); Oregon, Cusich (6000 ft. alt.). 



Mountains of Colorado to Oregon and British America. 



12. E. Caput-Medus.55 L. Sp. PI. 84 (1753). E. crinifvs 

 Schreb. Beschr. Graes. 15. ;*. 24 (1810). 



Culms slender, geniculate, 30-40 cm. high, the upper node not 

 over one-fifth as high as the culm. Leaves of the culm 2 in number, 

 upper sheath slightly inflated; ligule very short; blades involute, 

 narrow, 3-G cm. long. Spike dense, stout, 3-4 cm. long, with 

 spreading awns, some of which are 5 cm. long. Spikelets 2 at a 

 joint or only 1 on the lower part of the spike, 1 -flowered, rachilla 

 bearing an empty glume of a second floret ; empty glumes narrow, 

 rough, spreading, 2 cm, long; floral glume hispid, 7 mm. long, 

 gradually merging into the long awn. 



Oregon, Ilowell 1326. 



Introduced from Europe. 



13. E. Canadensis L. Sp. PI. 83 (1753), F. Philadelphicus L. 

 Amffin. Acad. 4:266 (1759). 



Culms stout, 60-120 cm, high. Leaves rough, 4-5, sheaths 

 mostly longer than the internodes; ligule about 1 mm. long, auric- 

 ulate; blades fiat or involute, 15-30 cm. long, 5-15 mm. wide. 

 Spikes exserted, nodding, 12-15 cm. long. Spikelets usually 2 at a 

 joint, 3-5-flowered ; empty glumes subulate, 1 mm. Avide, 3-4- 

 nerved, the nerves tapering into an awn usually shorter than itself; 

 fioral glume 10-12 mm. long, rough hairy with a slender awn 2-3- 

 cm. loug, usually spreading. 



Michigan, Beal 166; Illinois, Be(d 167; Colorado, Cassidy; 

 Montana, Anderson 27. 



New England to California. 



Var. glaucifolius (Muhl.) Torr. El. U. 8. 1:137 (1824). E. 

 glaucifolius Muhl. Willd. Enum. 1:131 (1809). 



