334 American Midland Naturalist Monograph No. 7 



6. Panicle-branches erect or ascending; spikelets 4- to 6- 



flowered; lemmas 2.5-3 mm long; sandy soil, chiefly in 



centr. and w. 111. [E. pilifera Scheele] 



E. trichodes (Nutt.) Wood 



5. Plants annual, usually 10-50 cm tall, decumbent at base. 



7. Keels of glumes and lemmas (and margins of leaves) with 



minute glands; spikelets 8- to 35-flowered. 



8. Spikelets 2.5-3 mm wide; waste places and cultivated 

 ground; nat. from Eur. June-Sept. Stink Grass \E. 

 megastachya Link] E. ciliancnsis (All.) Lut. 



8. Spikelets 1.5-2 mm wide; waste places and cultivated 



ground; nat. from Eur. \E. minor Host] 



E. poaeoides (L.) Beauv. 



7. Keels of glumes and lemmas glandless, scaberulous; spike- 

 lets usually 3- to 9-flowered, 1-1.5 mm wide; fields, waste 

 places, roadsides, and cultivated ground, common. July- 

 Sept. [E. purshii Schrad.; E. pilosa sensu auth., non (L.) 

 Beauv.] E. pectinacea (Michx.) Nees 



1 0. Diarrhena Beauv. 



D. americana Beauv. Woods, locally nearly throughout 111. June- 

 Sept. 



1 1 . Uniola L. — Spike Grass. Sea Oats 



U. latifolia Michx. Open woods in s. and central 111., extending 

 northward to Menard and Cook counties. June-Oct. 



12. Dactylis L. — Orchard Grass 



D. glomerata L. Fields and roadsides, very common; nat. from Eur. 

 May- June. 



13. Redfieldia Vasey 



R. flexuosa (Thurb. ) Vasey. Adv. from w. U.S. Carthage, Han- 

 cock Co., Alice L. Kibbc. July-Aug. 



14. Phragmites Trin. — Common Reed 



P comtnunis Trin. Marshy ground, locally in the n. and central 

 counties; formerly more abundant. Aug.-Sept. 



15. Melica L. — Melic Grass 



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

 leaves glabrous above, pubescent beneath ; rocky woods and 

 bluffs, not common. May-June M. mutica Walt. 



1. Glumes uneciual, shorter than the usually 3-flowered spikelet; 

 leaves pubescent above and glabrous or scabrous beneath; rocky 

 woods, somewhat more common than the preceding species. 

 May-June M. nitens (Scribn.) Nutt. 



