TWENTY-FIRST ANNUAL MEETING. 101 



162. A. caninum Reich.; Wheat grass. 



163. A. xjiolaceum Beauv.; Wheat grass. 



54. Hordeum L. 



a. Awns about 2 inches long, spike bushy in appearance 164 



«. Awns about j-inch long, spike not so bushy 165 



164. Hordeum jubatum L.: Squirrel-tail grass. 



165. H. piisillum Nutt.; Small Squirrel-tail grass. 



55. Elymus L. 



a. Culms rather tall, 2-5 feet high, outer glumes with short or long awns (6). 



a. Culms about a foot high (seldom 2 ft.), outer glumes long awned 169 



b. More or less pubescent, spike usually slender, awn 1 inch long 168 



b. Plant (except sometimes the flower) not pubescent (c). 



c. Spike rigidly uprigbt, peduncle short, often included in sheath 166 



c. Spike (5-9 in. long) soon nodding, on an exserted peduncle 167 



166. Elymus Virginicus L.; Wild or Smooth Rye grass, Terrell grass. 



167. E. Canadensis L.; Wild Rye, Lyme grass, Terrell grass. 



168. E. striatus Schultz; Rye grass, Dennett grass. 



169. E. Sltanion Schl.; Rye grass, Small Western Rye grass. 



5Q. Aspkella Willd. 

 ft. Spike loose, 3-6 inches long, spikelets early deciduous 170 



170. Asprella hystrix Willd.; Bottle-brush grass. 



