Vol. HI.] 

 [Vol. i: p. 



APPENDIX. 



507 

 False 



226.] ia. Agropyron pseudorepens Scribn. & Sm. 

 Couch-grass. (Fig. 524a.) 



Agropyron pseudorepens Scribn. & Sm. Bull. U. S- 



Dept. Agric. Div. Agrost. 4: 34. 1897. 



Light green. Culms i-3 tall, erect, smooth 

 and glabrous, from a running rootstock; sheaths 

 shorter than the internodes, smooth; ligule a short 

 membranous ring; leaves erect, prominently 

 nerved, rough on both surfaces, acuminate, the 

 culm leaves 3 / -S / long, i"-}>" wide, the basal 

 leaves about one-half as long as the culms; spikes 

 3 / -S / long, strict; spikelets 5 // -8 // long, 3-7-flow- 

 ered, a little compressed, appressed to the rachis 

 which is hispidulous on the margins; empty scales 

 lanceolate, equalling or somewhat shorter than the 

 spike! et, acuminate and often awn-pointed, 5-7- 

 nerved, the nerves hispidulous; flowering scales 5- 

 nerved, roughish toward the apex, usually awn- 

 pointed. 



Rich river bottoms, Montana to British Columbia, 

 south to Nebraska, Arizona and Texas. July-Aug. 



[Vol. 1: p. 226.] ib. Agropyron spi- 



catum (Pursh) Scribn. & Sm. Western 



Wheat-grass. (Fig. 524b.) 



Festuca spicata Pursh, Fl. Am. Sept. 1: 83. 1814. 

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

 Dept. Agric. Div. Agrost. 4: 33. 1897. 



Pale green, glaucous. Culms i}4-4 tall, 

 erect, from a slender creeping rootstock, smooth 

 and glabrous; sheaths shorter than the inter- 

 nodes, smooth; ligule a short .membranous 

 ring; leaves erect, 2 / -S / long, 2 // -4 // wide, acu- 

 minate, very scabrous above, smooth beneath, 

 becoming involute when dry; spike long-ex- 

 serted, strict, 4 / -8 / long; spikelets crowded, 

 divergent fro in the rachis, compressed,\&nczo\ale 

 when closed, y z '-\' long, 6-12-flowered; empty 

 scales acuminate, awn-pointed, shorter than the 

 spikelet, hispidulous on the keel; flowering 

 scales 5" -6" long, acute or awn-pointed, gla- 

 brous or sparsely pubescent. 



Moist land, Manitoba and Minnesota to Oregon, 

 south to Missouri and Texas. 



[Vol. 1: p. 226.] ic. Agropyron tetra- 

 stachys Scribn. & Sm. Coast Wheat-grass. 

 (Fig. 524c.) 



Agropyron tetrastachys Scribn. & Sm. Bull. U. S. Dept. 

 Agric. Div. Agrost. 4: 32. 1897. 



Glaucous. Culms rigid, slender, erect, ij-3 tall, 

 from a running rootstock; sheaths shorter than the in- 

 nodes, smooth and glabrous; ligule wanting; leaves 

 erect, acuminate, 5 / -S / long, 1" or less wide, smooth 

 beneath, glaucous above, scabrous on the margins; 

 spikes long-exserted, 3 / ~5 / long, 4-sided ; spikelets 

 crowded, 6"- Jo" long, 6-ii-fiowered, appressed to the 

 4-angled articulated rachis, the angles hispidulous; 

 empty scales lanceolate, 5" long, rough on the keel, 

 5-7-nerved; flowering scales lanceolate, keeled, rough 

 toward the apex, acute, awn-pointed or short-awned. 



Sandy beaches, coast of Maine. July-Aug. 



