Jones: Flora of Illinois, 22. Gramineae 55 



3. Lemmas awned, the awn 1-3 cm. long; spike dense; glumes 7-9 mm. 



long; woods and meadows, rare. Ringwood, Vasey. July- Aug. [/4. 

 caninum sensu auth., non (L.) Beauv.} A. caninoides (Ramaley) 



Beal} A. subsecundum (Link) Hitchc. 



2. Plants stoloniferous, with horizontal rhizomes; glumes smooth, except on 

 the keel. 



4. Leaves glaucous; spikelets 7-13-flowered, L5-2.5 cm. long; along rail- 



roads, adv. from w. U.S. June-July. Bluestem A. stnithii Rydb. 



4. Leaves green; spikelets mostly 4-6-flowered, 1-L5 cm. long; waste 

 ground and fields, common; nat. from Eur. June-July. Quack Grass. 

 A. repens (L.) Beauv. 



16. Triticum L. — Wheat 

 T. aestivum L. Roadsides and fields, occasionally spontaneous 



17. Secale L. — Rye 

 S. cereale L. Occasionally spontaneous in fields and waste ground. 



18. Elymus L. Wild Rye 



1. Lemmas awnless; spike erect, dense, 7-25 cm. long; sand dunes along L. 

 Michigan. Cook Co., Killip in 1916; also Lake Co., G. D. Fuller. June- 

 July. [E, arenarius sensu Am. auth., non L.} Dune Grass 



E. mollis Trin. 



1 . Lemmas awned. 



2. Glumes subulate, obscurely nerved, 12-20 mm. long; spike nodding; 

 woods. June-Aug. \E. strtatus sensu auth., non Willd.} Slender Wild 



Rye E. villosus Muhl. 



2. Glumes lanceolate, 3 to several-nerved. 



3. Awn of lemma straight, about 1 cm. long; spike usually erect; glumes 

 strongly bowed out at base; roadsides and woods, common and 



variable. July-Aug E. virginicus L. 



3. Awn of lemma curved when dry, 2-3 cm. long; spike nodding; glumes 

 not bowed out at base; roadsides and edges of woods, common. July- 

 Aug. Nodding Wild Rye E. canadensis L. 



19. Hystrix Moench 



H. patula Moench. Bottlebrush Grass. Woods, common. June-July. [Hys- 

 trix hystrix (L.) Millsp.} 



20. HoRDEUM L. — Barley 



1. Rachis of spike becoming disjointed. 



2. Spikes nodding, 6-16 cm. long; awns 2-6 cm. long; tufted perennials. 

 3. Blades 2-4 mm. wide; awns 3-6 cm. long; roadsides and fields, common. 



June-Aug. Squirrel-tail Grass H. jubatum L. 



3. Blades 5-8 mm. wide; awns 2-3.5 cm. long; prairies and roadsides, 



chiefly w. 111. June-Aug. H. pammeli Scribn. dC Ball 



H. montanense Beal 



