PLANTS OF IOWA 133 



1657. 8. vaginceflorus, (Torr.) Wood. Sheathed Rush-grass. 

 Dry soil, frequent. 



165S. 8. neglectus, Nash. Small Rush-grass. 

 Frequent in dry soil. 



1659. S. cuspidatus, (Torr.) Wood. Prairie Rush-grass. 

 In dry ground ; frequent. 



1660. 8. cryptandrus, (Torr.) A. Gray. Sand Dropseed. 

 Dry sand ; frequent. 



1661. 8. heterolepsis, A. Gray. Northern Dropseed. 

 In dry soil, common. 



1662. 8. asperifolius, Nees & Meyen. Rough-leaved Dropseed. 

 Rare (?) 



ClNNA, L. 



1663. C. arundinaccea, L. Wood Reed-grass. 

 Moist woods, frequent. 



Agrostis, L. 



1664. A. alba, L. Red-top. 

 Common on low ground. 



1665. A. perennans, (Walt.) Tuckerm. This-grass. 

 Damp shady places, frequent. 



1666. A. hyemalis, (Walt.) B. S. P. Rough Hair-grass. 

 Dry soil, frequent. 



Calamagrostis, Adans. 



1667. C. canadensis, (Michx.) Beauv. Blue Joint-grass. 

 Common on wet soil. 



1668. C. canadensis acuminata, Vasey. Sharp-pointed Red- 



top. 

 Infrequent. 



1669. C. macouniana, Vasey. Macoun's Reed-grass. 

 Rare. 



1670. C. inexpansa, A. Gray. Bog Reed-grass. 

 Not common. 



Calamovilfa, Hack. 



1671. C. longifolia, (Hook.) Hack. Long-leaved Reed-grass. 

 Sandy soil, not common. 



