336 American Midland Naturalist Monograph No. 7 



2. Lemmas and glumes pubescent; along railroad, Du Page Co., 

 June 26. 1897, Mofjatt 231; adv. from w. U.S. [A. dasy- 



stacliyum of auth., not (Hook.) Scribn.] 



- A. ynollc (Scribn. & Smith) Rydb. 



1. Spikelets pectinately spreading, crowded in a flattened spike; 

 glumes keeled, awned, glabrous; spikelets 3-flowered; introd. 

 from Eurasia, and occasionally spontaneous. 

 6. Spikelets 8-12 mm long with awns 2-3 mm long; waste ground, 



Cook Co., /. W. Thierct in 1956 



A. desertorum (Fisch.) Schultes 



6. Spikelets 5-7 mm long, the awns 2-5 mm long; waste places, 

 occasional. Crested Wheat Grass A. cristatnm (L.) Gaertn. 



20. Triticum L. — Wheat 



T. aestivum L. Roadsides and fields; occasionally spontaneous but 

 not persisting; of Eiuasian origin. 



21. Aegilops L. — Goat Grass 

 A. cylindrica Host. Waste places; an occasional railroad migrant; 

 introd. from Eur. 



22. Secale L. — Rye 

 S. cerealc L. Occasionally spontaneous in fields and waste ground; 

 often planted as a soil binder along new roads and sometimes briefly 

 persisting; native of Eurasia. May- July. 



23. Elymus L. — Wild Rye 



1. Lemmas awnless; spike erect, dense, 7-25 cm long; sand dunes 

 along L. Michigan; native of Eur. June-July. Dune Grass [E. 



mollis sensu auth., non Trin.] E. arcnarius L. 



1. Lemmas usually awned. 



2. Glumes subulate, 0.5-1 mm wide. 



3. Spikes 10-25 cm long, loose; spikelets 2-4-flowered ; palet 7-8 



mm long; chiefly alluvial soil, occasional. July-Sept 



E. ripariiis Wieg. 



3. Spikes 5-15 cm long, compact; spikelets 1-2-flowered; palet 



5-7 mm long; woods, common. June-Aug. Slender Wild 



Rye E. villosus Muhl. 



2. Glumes lanceolate, 2- to several-nerved, 2 mm or more in width. 



4. Awn of lemma straight, about 1 cm long; spike usually erect; 



glumes strongly bowed out at base; roadsides and w^oods. 



common and variable. July-Aug E. virginicus L. 



4. Awn of lemma curved when dry, 2-4 cm long; spike nodding; 

 glumes not bowed out at base; roadsides and edges of 



woods, common. July-Aug. Nodding Wild Rye 



E. canodensis L. 



24. Hystrix Moench — Bottlebrush Grass 

 H. patula Moench. Woods, common throughout 111. June-July. 



