164 IOWA ACADEMY OF SCIENCES. 



Q. rubra L. Decatur, Appanoose, Wapello, Van Buren, and 

 Johnson Cos. Woods, frequent. 



Q. coccinea Wang. Decatur, Appanoose, and Johnson Cos. 

 Upland woods, common. 



Q palustris Du Roi. Decatur and Appanoose Cos. Low 

 woods, frequent. 



Q. imbricaria Mx. Decatur, Appanoose, Wapello, and 

 Washington Cos. Woods, common. 



Q. nigra L. Decatur Co. Dry upland woods, frequent. 



SALICACE^E. 



Salix longifolia Muhl. Shelby and Page Cos. Frequent, 



S. discolor Muhl. Shelby and Johnson Cos. Low grounds, 

 common. 



S. humilis Marsh. Decatur, Shelby, and Johnson Cos. 

 Prairies, frequent. 



Populus tremuloides Mx. Decatur, Appanoose, Shelby, and 

 Johnson Cos. Upland woods, common. 



P. grandidentata Mx. Johnson Co. Woods, common. 



P. monilifera Ait. Decatur, Appanoose, Shelby, and John- 

 son Cos. Rich woods, common. 



P. alba L. , var. nivea. Decatur Co. A frequent escape. 



CONIFERS. 



Juniperus virginiana L. Van Buren and Johnson Cos. 

 River bluffs, frequent. 



HYDROCHARDIACE^E. 



Elodea canadensis Mx. Johnson Co. Ponds, frequent. 

 Vallisneria spiralis L. Johnson Co. Infrequent. 



orchidace^e. 



Microstylis ophioglossoides Nutt. Johnson Co. We have one 

 specimen collected in low woods. 



Liparis liliifolia Richard. Upland woods, frequent. 



Aplectum hiemale Nutt. Johnson Co. Rich woods, infre- 

 quent. 



Corallorhiza odontorrhiza Nutt. Johnson Co. Rich upland 

 woods, common at least locally. 



Spiranthes gracilis Bigelow. Johnson Co. Open upland 

 woods, infrequent. 



Ooodycra pubescens R. Br. Johnson Co. Infrequent. 



