5o8 



APPENDIX. 



[Vol. III. 



Agropyron Gmelini Scribn. & Sm. Gmelin's 

 Wheat-grass. (Fig. 528a.) 



Agropyron Gmelini Scribn. & Sm. Bull. U. S. 

 Dept. Agric. Div. Agrost. 4: 30. 1897. 



Culms i;^°-4° tall, erect, slender, tufted, 

 smooth aud glabrous, no roolstocks. Sheaths 

 smooth, usually longer than the internodes; 

 ligule a short membrauous ring; leairs erect, 

 4'-io' long, i"-y' wide, acuminate, smooth be- 

 neath, scabrous on the margins and sometimes 

 also sparsely so above; spike slender, long-ex- 

 sertcd, 2'-.S' long; spikelets 6-20, somewhat 

 crowded, appresscd to the rachis, more or lesa 

 compressed, ^-^-flowercd: empty scales %"-l" 

 long, shorter than the spikelet, acuminate into^ 

 a shorter awn; flowering scales 4"-6" long, 

 acuminate, bearing at or just below the apex a 

 slender scabrous awn 7"-i5" long. 



Bottom lands, Washington to western Nebraska, 



[Vol. I: p. 231.] 3a. Elymus inter- 

 medius (Vasey) Scribn. & Sm. 

 Strict Wild Rye. (Fig. 535a.) 



Elymus Canadensis \'3.r. in/ermedins Vasey; Wats. & 



Coult. in A. Gray, Man. Ed. 6, 673. 1890. 

 Elymus intermedins Scribn. & Sm. Bull. U. S. Dept. 



Agric. Div. Agrost. 4: 38. 1897. 



Culms erect from a perennial root, 2°-3° tall, 

 smooth and glabrous. Sheaths longer than the 

 internodes, smooth, the uppermost often inflated 

 and enclosing the base of the spike; ligule a short 

 membranous ring; leaves 7'-! 2' long, 4"-9''' wide, 

 acuminate, very rough on both surfaces; spikes 

 2|^'-6' long, stout, the rachis pubescent; spikelets 

 crowded, in pairs, 2-5-flowered; empty scales linear, 

 5"-6" long, thick, 3-5-nerved, the nerves hirsute, 

 acuminate into a scabrous awn as long as or shorter 

 than the scale; flowering scales lanceolate, 5-nerved, 

 appressed-hirsute, \"-'S" long, acuminate into a 

 rough awn 6"-S" long. 



River banks, Maine to Virginia, west to Illinois and 

 Nebraska. July-Aug. 



[Vol. I: p. 231.] 3b. Elymus robustus 



Scribn. & Sin. Stout Wild Rye. 



(Fig. 535b.) 



Elymus robustus Scribn. & Sm. BuU.U. S. Dept. Agric. 



Div. Agrost. 4: 37. 1S97. 



Culms erect, usually stout, 3''-6° tall, smooth and 

 glabrous. Sheaths longer than the internodes, 

 smooth or slightly roughened; ligule a short cori- 

 aceous ring with acute lateral auricles; leaves firm, 

 very rough on both surfaces, 4'-i5' long, 4"-lo"' 

 wide, acuminate; spike little exserted, stout, 

 4'-9' long, the rachis usuallj' glabrous except on 

 the angles; spikelets numerous, crowded, in 2's-^'s, 

 3-4-flowered; empty scales subulate, 5 "-5" long, 

 bearing an awn 6"-9" long; flowering scales lan- 

 ceolate, 5"-6" long, 2-toothed at the apex, from 

 sparsely to densely appressed -pubescent, bearing 

 a flex nous or bent aivn i5"-24" long. 



River banks. Ontario and Vermont to Oregon, south 

 to North Carolina, Texas and Arizona. 



