48 Tennessee Ploka. 



H. vulgare L. Grains arranged in four rows. Cult. 



H. hexastichum L. Grains arranged in six rows. Cult. 



The latter four species are found in cultivation only. They 

 have ceased to mature germinating seed outside of cultiva- 

 tion in our latitude. Hordeum distichum is still found in a 

 wild state in Western Asia and in Arabia Petraea'; Hordeum 

 hexastichum we know to have been cultivated in the remotest 

 ages of which we possess records in Egypt and the Syro-Baby- 

 lonian countries. 



ELYMUS L. 



Elymus striatus Willd. Wild rye. O. S. July, August. 



E. striatus villosus Gray. In the barrefis with the former. 

 O. S. July, August. 



E. Canadensis L. O. S. July. 



E. Canadensis glaucifolius Gray. In the cedar glades. 

 July-September. 



E. Virginicus L. Very common. O. S. * July. 



HYSTRIX Mcench. 



Hystrix Hystrix (L.) Millsp. Bottle brush grass. As- 

 prella Hystrix Willd. In rocky ground. O. S. June, July. 



BAMBUSE^. 

 ARUNDINARIA Michx. 



Arundinaria gigantea Chapm. Cane. Forming the cane- 

 brakes of all the Southern water courses. May- July. 



A. tecta Miihl. Small cane. In low and high lands. 

 Surnmit of Lookout Mt. O. S. The cain reaches maturity 

 and dies off when the shoots attain io"-i5° height, and bears 

 seeds from auxiliary branches. A. tecta is merely a young 

 state throwing flowering shoots immediately from the roots. 



CYPERACE.^ J. St. Hill. 

 CYPERUS L. 



Cyperus flavescens L. In marshy ground. O. S. August- 

 October. 



C. diandrus Torr. With the former. July-September. 



C. rivularis Kunth. C. castaneus Torr. In wet soil. O. S. 

 August-October. 



C. inflexus Miihl. C. aristatus Rottb. Glades and sandy 

 river banks. O. S. July. 



C. pseudovegetus Steud. C. calcaratus Nees. Damp soils. 

 O. S. July. , 



C. aicuminatus Torr and Hook. Cedar glades. Lavergne. 



July- 



