PLANTS OF IOWA 139 



1745. A. tenerum, Vassey. Slender Wheat-grass. 

 Not infrequent northward. 



1746. A. spicatum, (Pursh.) Scribn. & Sm. Western Wheat- 



grass. 

 Common northward. 



1747. A. repens, (L.) Beauv. Quack Grass. 

 Common weed from Europe. 



Hordeum, L. 



1748. H. nodosum* L. Meadow Barley. 

 Infrequent. 



1749. H. pusillum, Nutt. Little Barley. 

 Introduced, not common. 



1750. H. jubatum, L. Squirrel-tail Grass. 

 A common weed. 



1751. H. pammeli, Scribn. & Ball. Pammel's Wild Barley. 

 Infrequent. 



Elymus, L. 



1752. E. striatus, Willcl. Slender Wild Rye. 

 Common in low woods. 



1753. E. virginicus, L. Virginia Wild Rye. 

 Waste land ; common. 



1754. E. Jiirsutiglumis, Scribn. & Sm. Strict Wild Rye. 

 Infrequent. 



1755. E. canadensis, L. Nodding Wild Rye. 

 Common in waste land. 



1756. E. arkansanus, Scribn. & Ball. Arkansas Wild Rye. 

 Infrequent, southward. 



1757. E. robustus, Scribn. & Sm. Stout Wild Rye. 

 Common. 



1758. E. macounii, Vasey. Macoun's Wild Rye. 

 In low ground ; northward. 



Hystrix, Moench. 



1759. H. hystrix, (L.) Millsp. Bottle-brush Grass. 

 Moist woods; frequent. 



