128 STATE HORTICULTURAL SOCIETY 



1583. S. engelmanniana, J. G. Smith. Engelmann's Arrow- 



head. 



1584. 8. latifolia, Willd. Broad Leaved Arrowhead. 

 Common in mud and shallow water along ponds and 



sluggish streams. 



1585. S. arifolia, Nutt. Arum-Leaved Arrowhead. 

 Common in bogs. 



1586. 8. rigidi, Pursh. Sessile Fruited Arrowhead. 

 Infrequent. 



1587. 8. cristata, Engelm. Crested Arrowhead. 

 Rare. 



1588. 8. graminea, Michx. Grass Leaved Arrowhead. 

 Frequent in wet places. 



VALLISNERIACE.E. TAPE-GRASS FAMILY. 



Philotria, Michx. 



1589. P. canadensis, (Michx.) Britton. Ditchmoss. 

 Common in ponds. 



Vallisneria, Micheli. 



1590. V. spiralis, L. Eel-Grass. 

 Frequent. 



GRAMINEA. GRASS FAMILY. 

 TRIPSACUM, L. 



1591. T. dactyloides, L. Gama Grass. 

 Infrequent. 



Andropogan, L. 



1592. A. scoparius, Michx. Broom Bearded Grass. 

 Dry soils. Common. 



1593. A. frucatus, Muhl. 

 Dry soil. Common. 



1594. A. halli, Hack. Hall's Beard Grass. 

 Sandy soil. Infrequent. 



SORGHASTRUM, Nash. 



1595. S. avenaceuwij (Michx.) Nash. Indian Grass. 

 Common on prairie. 



