330 American Midland Naturalist Monograph No. 7 



10. First glume 3-nerved; second glume 5- or 7-nerved; lemmas 

 broad, obtuse. 

 1 1 . Panicle open, the branches ascending or drooping. 



12. Sheaths glabrous; awns shorter than the lemmas; 



fields and waste places. May-July. Cheat 



B. secalinus L. 



12. Sheaths pilose. 



13. Awns straight, 7-10 mm long. 



14. Lemmas 7-8 mm long; spikelets 3-4 mm 

 wide; anthers 4 mm long; waste places, 



Adams, Fulton, and Jersey counties 



- B. arvensis L. 



14. Leinmas 9-11 mm long; spikelets 6-7 mm 

 wide; anthers 1.5-2 mm long; fields and 



waste places. May-July 



B. commutatus Schrad. 



13. Awns flexuous, divergent at maturity, 9-12 mm 

 long; waste places; nat. from Eurasia. May- 

 July. Japanese Chess B. japonicus Thunb. 



11. Panicle small, dense, erect or nearly so, 5-10 cm long; 

 sheaths pubescent. 

 15. Lemmas glabrous, 7 mm long; roadsides and waste 



places. June-Aug B. raceynosus L. 



15. Lemmas pubescent, 9-10 mm long; roadsides, waste 



places, and fields. May-July. Soft Chess ..B. mollis L. 

 10. First glume 1 -nerved; second glume 3-nerved; sheaths 

 pubescent; awns longer than the acuminate lemmas. 

 16. Awns 10-17 mm long; lemmas pubescent; panicle 

 dense; roadsides and fields. May-July. Downy Cheat 



B. tectorum L. 



16. Awns 2-3 cm long; lemmas scabrous; panicle loose; 



waste places. May-July ...B. stcrilis L. 



3. Schizachne Hack. 



S. purpurascens (Torr. ) Swallen. Moist wooded slope, Apple River 

 Canyon, near Stockton, Jo Daviess Co., Jime 16, 1937, F. /. Hermann 

 8829. 



4. Festuca L. — Fescue Grass 

 {Vulpia K.C.Gmel.) 



1 . Leaves 3-8 mm wide, flat. 



2. Panicle narrow, erect; lemmas (including the awn) 5-10 mm 

 long; meadows, roadsides, fields, waste places; nat. from 

 Eur. June-July. Meadow Fescue. Var. arundinacea (Schreb. ) 

 Wimm. [F. arundinacva Schreb.] Tall Fescue, a larger and 

 stouter plant with wider leaves, is collected occasionally, 

 Peoria and Tazewell counties, V. H. Chase in 1953; Piatt 



Co., G. N. Jones in 1957 F. elatior L. 



2. Panicle open; lemmas 4-5 mm long. 



