146. Gramineae 337 



25. Hordeuni L. — Barley 



1. Racliis of spike becoming disjointed. 



2. Spikes nodding, 6-16 cm long; awns 2-6 cm long; tufte^d 

 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; open woods, hill- 

 sides, prairie soil ; Marshall, Peoria, and Stark counties, 

 I'. H. Chase. June-Aug. Said to be a sterile Fi hybrid of 

 H. jubatum and Elymus canadensis. [H. pammeli Scribn. 



& Ball] H. montanense Scribn. 



2. Spikes erect. 2-6 cm long; awns less than 1.5 cm long; blades 

 2-4 mm wide; plants annual; roadsides and fields. May- June. 



Small Wild Barley H. pusillum Nutt. 



1. Rachis of spike not disarticulating; blades flat, 5-15 mm wide; 

 plants annual; cult., and sometimes spontaneous; introd. from 

 Eur. Barley H. vulgare L. 



26. Lolium L. — Rye Grass 



1. Glume shorter than the spikelet; plants perennial. 



2. Lemmas awned; spikelets mostly 10- to 20-flowered; lawns, 

 roadsides, and fields; nat. from Eur. June-Aug. Italian Rye 



Grass L. multiflorum Lam. 



2. Lemmas awnless or short-awned; spikelets mostly 5- to 10- 

 flowered; meadows, lawns, roadsides; nat. from Eur. June- 

 Aug. English Rye Grass L. perenne L. 



1. Glume as long or longer than the spikelet; plants annual; lemmas 

 awned; waste places and wheat fields, rare; not recently coll. in 

 111.; adv. from Eur. June-Aug. Darnel L. ternulentum L. 



Tribe 4. Aveneae. — Oat Tribe 

 27. Koeleria Pers. — June Grass 

 K. cristata (L.) Pers. Sandy soil, local. June-July [K. gracilis Pers.] 



28. Sphenopholis Scribn. — Wedge Grass 



1. Second glume firm, rounded and somewhat cucuUate at apex. 2 

 mm long, nearly as wide; first glume linear; anthers 0.4-0.8 mm 

 long; panicles erect or nearly so, compact; prairie soil, and in 



open woods. May-June S. obtusata (Michx.) Scribn. 



1. Second glimie thin, acute or apiculate; panicles lax, nodding. 

 2. Lemmas not scabrous; spikelets 2.5 mm long; first glume linear, 

 0.2 mm wide; second glume 2-2.5 mm long; anthers 0.3-0.5 

 mm long; woods, fields, roadsides, frequent nearly throughout 



111. May-June S. intermedia Rydb. 



2. Lemmas scabrous-papillate; spikelets about 3 mm long; first 

 glume narrowly elliptical, 0.8 mm wide; second glume nearly 

 3 mm long; anthers 1-2 mm long; woods, not common in 111. 

 May-June S. nitida ( Sjjreng. ) Scribn. 



