54 American Midland Naturalist Monograph No. 2 



7. Keels of glumes and lemmas glandless, scaberulous; spikelets usually 

 3-9-flowered, 1-1.5 mm. wide; fields, waste places, roadsides, and 

 cult, ground, common. July-Sept. [£. purshii Schrad.; E. pilosa of 

 auth., not (L.) B'eauv.} E. pectinacea (Michx.) Nees 



8. DiARRHENA Beauv. 



D. americana Beauv. Woods, locally throughout III. June-Sept. [Diarina 

 festucoides Raf.; Korycarpus cirundtnaceus Zea ex Lag.; Diarrhena diandra 

 (Michx.) Wood; Diarrhena festucoides sensu Fern., non Raspail}. 



9. Uniola L. 

 U. latifolia Michx. Open woods in s. and centr. III. June-Oct. 



10. Dactylis L. 



D. glomerata L. Orchard Grass. Fields and roadsides, very common; nat. 

 from Eur. May- June. 



11. PhraGMITES Trin. 



P. communis Trin. Common Reed. Wet ground, n. and centr. 111. Aug- 

 Sept. 



12. Melica L. 



1 . Glumes nearly equal and almost as long as the 2-flowered spikelet; leaves 



glabrous above, pubescent beneath; open woods. May-June 



M. miitica Walt. 



1. Glumes unequal, shorter than the usually 3-flowered spikelet; leaves pubes- 

 cent above and glabrous or scabrous beneath; rocky woods, more common 

 than the preceding species. May-June M. nttens Nutt. 



13. Triodia R. Br. 



{Tridens R. & S.) 



T. flava (L.) Smyth. Purpletop. Sandy soil and open woods in centr. and 

 s. 111., and extending northw. to Peoria and Kankakee counties. July-Sept. 



14. Triplasis Beauv. — Sand Grass 

 T. purpurea (Walt.) Chapm. Dry sand, centr, and n. III. Aug.-Sept. 



15. Agropyron Gaertn. — Wheat Grass 



1. Lemmas villous; plants with rhizomes; sandy shores of L. Michigan. July- 



Aug A. dasystachyum (Hook.) Scribn. 



1. Lemmas glabrous or merely scabrous. 



2. Plants tufted, not stoloniferous; horizontal rhizomes absent; glumes 

 scabrous on nerves and margins. 

 3. Lemmas awnless or short-awned; spike slender, lax; glumes 10-12 mm. 

 long; dry soil, rare. Cook Co., Agnes Chase; Stark Co., V. H. 



Chase. July-Aug. [/I. tenerum Vasey.} Slender Wheat Grass 



A. pauciflorum (Schw.) Hitchc. 



