56 American Midland Naturalist Monograph No. 2 



2. Spilces 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 an- 

 nual; cult., and sometimes spontaneous; introd. from Eur. Barley 



H. vulgare L. 



21. LoLlUM L. — Rye Grass 

 1. Glume shorter than the spiloelet; plants perennial. 



2. Lemmas awned; spikelets mostly 10-20-f lowered; lawns, roadsides, and 



fields; introd. from Eur. June-Aug. Italian Rye Grass 



L. multiflorum Lam. 



2. Lemmas awnless or short-awned; spikelets mostly 5-10-flowered; meadows, 



lawns, roadsides; native of Eur. June-Aug. English Rye Grass 



L. perenne L. 



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

 waste places, introd. from Eur. June-Aug. Darnel L. temulentum L. 



22. KoELERiA Pers. 



K. gracilis Pers. June Grass. Sandy soil, local. June-July. [K. cristata sensu 

 auth., non (L.) Pers.] 



23. Sphenopholis Scribn. — Wedge Grass 



1. Panicle narrow, densely-flowered, spike-like, erect or nearly so; prairies and 



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



1. Panicle lax, nodding, not spike-like, the branches more or less spreading. 

 2. Glumes subequal, the second broadly obovate, obtuse; lemmas obtuse, 



scabrous; woods. May-June S. nitida (Spreng.) Scribn. 



2. Glumes unequal, the first shorter than the narrowly obovate second one; 

 lemmas acute, glabrous; woods, fields, and roadsides. May-June. \S. 

 pallens sensu auth., non (Spreng.) Scribn.} S. intermedia Rydb. 



24. Deschampsia Beauv. — Hair Grass 



D. cespitosa (L.) Beauv. Moist soil along streams in the n. part of the 

 state. June-July. 



25. Avena L. — Oat 



1. Lemmas bearing stiff brownish hairs, at least at base; awn stout, geniculate, 



strongly twisted; spikelets mostly 3-flowered; fields and waste places; nat. 



from Eur. May-July. Wild Oat A. jatua L. 



1. Lemmas glabrous; awn small, usually straight, or absent; spikelets mostly 



2-flowered; commonly cult., occasionally spontaneous. May July. Oat 



A. sativa L. 



26. Arrhenatherum Beauv. 

 A. elatius (L.) Mert. & Koch. Tall Oat Grass. Fields, roadsides, and 

 waste places; nat. from Eur. June-July. 



