Genus 106. 



GRASS FAMILY. 



13. Elymus canadensis L. Nodding Wild 

 Rye. Canada Lyme-grass. Fig. 712. 



Elymus canadensis L. Sp. PI. 83. 1753. 



Elymus glaucifolius Willd. Enum. 1 : 131. 1809. 



Elymus canadensis var. glaucifolius Torr. Fl. U. S. I : 



137. 1824. 

 Elymus robustus Scribn. & Sm. Bull. U. S. Dep. Agr. 



Agric. 4: 37. 1897. 



Culms 2j°-5° tall, erect, simple, smooth and gla- 

 brous. Sheaths usually overlapping; ligule very 

 short; blades 4'-i° long or more, 2"-io" wide, 

 rough, sometimes glaucous; spike 4-12' in length, 

 broad, stout, often nodding, its peduncle much ex- 

 serted; spikelets divergent from the rachis, 3-5- 

 flowered; empty scales narrowly lanceolate, rigid, 

 3-5-nerved, 8"-i6" long, including the long slender 

 rough awns; flowering scales 4"-7" long, hirsute, 

 bearing a slender scabrous straight or divergent awn 

 io"-2S" in length. 



On river banks, Nova Scotia to Alberta and Washing- 

 ton, south to New Jersey, West Virginia, Missouri and 

 Arizona. Ascends to 2100 ft. in Virginia. July-Aug. 



14. Elymus brachystachys Scribn. & Ball. 

 • Short-spiked Wild Rye. Fig. 713. 



Elymus brachystachys Scribn. & Ball, Bull. U. S. Dep. Agr. 

 Agrost. 24: 47./. 21. 1901. 



Culms i°-3° tall, erect; sheaths glabrous; blades up 

 to 8' long, 3"-6" wide, rough, or sometimes smooth 

 below; spike 3'-6' long, i'-ii' in diameter, long- 

 exserted ; spikelets 3-5-flowered, in pairs, the empty 

 scales hispidulous, flat, narrowly lanceolate, 3-5-nerved, 

 attenuate into a hispidulous awn about three times 

 their length, the flowering scales glabrous or his- 

 pidulous, bearing an awn 10" -20" long. 



Moist grounds, Maryland to Michigan, South Dakota, 

 Texas and Mexico. July and Aug. Figured in our first 

 edition as E. canadensis L. from which it is now dis- 

 tinguished. 



15. Elymus striatus Willd. Slender Wild 

 Rye. Dennett-grass. Fig. 714. 



Elymus striatus Willd. Sp. PI. 1 : 470. 1797- 

 Elymus striatus var. villosus A. Gray, Man. 603. 1848. 

 Elymus striatus Ballii Pammel, la. Geol. Surv. Suppl. 

 Rep. 1903: 347. 1904. 



Culms 2°-3° tall, erect, slender, simple, smooth, 

 glabrous. Sheaths usually shorter than the inter- 

 nodes, glabrous or hirsute; ligule very short; leaves 

 5'-o' long, 2"-s" wide, smooth or slightly rough 

 beneath, pubescent above; spike 2i'-4i' in length, 

 broad, slender, dense; spikelets divergent from the 

 rachis, 1-3-flowered ; empty scales awl-shaped, 

 9"-i2" long, including the slender rough awn, 1-3- 

 nerved, hirsute; flowering scales about 3" long, 

 hirsute, bearing a slender rough awn 8"-is" in 

 length. 



In woods and on banks, Maine to North Dakota, North 

 Carolina and Texas. Spike often nodding. June-July. 



