5 o8 



APPENDIX. 



[Vol.. III. 



Agropyron Gmelini Scribn. & 

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



S. 



Agropyron Gmelini Scribn. & Sm. Gmelin's 

 Wheat-grass. (Fig. 528a.) 



Sm. Bull. U 



1897. 



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

 smooth and glabrous, no rootstocks. Sheaths 

 smooth, usually longer than the internodes; 

 ligule a short membranous ring; leaves erect, 

 4 / -io / long, l // -3 // wide, acuminate, smooth be- 

 neath, scabrous on the margins and sometimes 

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

 serted, 2 / -S / long; spikelets 6-20, somewhat 

 crowded, appressed to the rachis, more or less 

 compressed, 5-9-Jlowered; empty scales 5 // ~7 // 

 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- 

 medins (Vasey) Scribn. & Sm. 

 Strict Wild Rye. (Fig. 535a.) 



Elymus Canadensis var. intermedins 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 / -i2 / long, 4 // -9 // wide, 



acuminate, very rough on both surfaces; spikes 



2j^ / -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, 4 // -5 // long, acuminate into a 



rough awn 6 // -8 // long. 



River banks, Maine to Virginia, west, to Illinois and 

 Nebraska. July-Aug. 



[Vol. 1: p. 231.] 3b. Elymus robustus 



Scribn. & Sm. Stout Wild Rye. 



(Fig. 535b.) 



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

 Div. Agrost. 4: 37. 1897. 



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 // -io // 

 wide, acuminate; spike little exserted, stout, 

 4 / ~9 / long, the rachis usually glabrous except on 

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

 3-4-flowered; empty scales subulate, 5 // -6 // 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 

 aflexuous or bent azvn \$"-2\" long. 



River banks, Ontario and Vermont to Oregon, south 

 to North Carolina, Texas and Arizona. 



