654 POAC'E^. 



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

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

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

 bles Agropyron iu having some single spikelets, Ilordeum in having 

 a small spikelot raised on a pedicel, and Elynrux in other particulars. 

 Colorado, Vamjm 1S84; Montana, Anihrson'i^; British Amer- 

 ica, Macoim (4500 ft. alt); Oregon, Cusich (GOOO ft. alt.). 

 Mountains of Colorado to Oregon and British America. 

 12. E. Caput-Medus.e L. Sp. PI. 84 (ITSS). E. rrimfva 

 Schreb. Beschr. Graes. 1'). /. 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; l)lades involute, 

 narrow, 3-<; 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-floweretl, racliilla 

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

 rough, spreading, 2 cm. long; floral glume liispid, 7 nun. long, 

 gradually merging into the long awn. 

 Oregon, Ilovell 132G. 

 Introduced from Europe. 



13. E. Canadensis L. Sp. V\. 83 (1753). E. riiilmJeJpJnnfs L. 

 Amu'n. Acad. 4:200 (i:5i>). 



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

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

 idate; blades flat 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 subulatt;, 1 mm. wide, 3-4- 

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

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

 cm. long, usually spreading. 



Michigan, Be((l IGO; Illinois, Beat 107; Colorado, Casxidy; 

 Montana. Anderson 27. 



New Endand to California. 



Yar. glaucifolius (Muhl.) Torr. Fl. U. S. 1:137 (1824). E. 

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



