IOWA ACADEMY OF SCIENCES. 133 



SALICACE^E. 



Salix humilis Marsh. 



Sioux City, common on prairies and at base of loess mounds 

 (L. H. P.). 

 S. longifolia Muhl. 



Sioux City (B. W.). 

 Populus monilifera Ait. 



Missouri Valley, in bottoms near streams, in swales between 

 loess mounds; occasionally near top of mound. Com- 

 mon (L. H. P.), South Dakota, opposite Hawarden 

 (L. H. P.); Sioux City (B. W.). 



CERATOPHYLLACE^E. 



Ceratophyttum demersum L. 



Sioux City (B. W.). 



CONIFERvE. 



Juniperus Virginiana L. 



Sioux City (B. W.). 



ORCHIDACE.E. 



Orchis spectabilis L. 



Sioux City (B. W.). 

 Habenaria leucophcea Gray. 



Cherokee 'B. W.). 

 Spiranthes ceriy.ua Richard. 



Smithland (B. W.). 

 Cypripedium pubescens Willd. 



Cherokee, Smithland (B. W.). 



IRDIACE^E. 



Iris versicolor L. 



Sioux City (B. W.). 



LILIACE.E. 

 Siuilax herbacea D. 



Sioux City (B. W.). 

 Allium stellatum Fras. 



Alton, common on prairies (L. H. P.). 

 A. Canadense Kalm. 



Sioux City (B. W.). 

 Yucca angustifolia Pursh. 



Council Bluffs, Missouri Valley, Sioux City, Turin (L. H. 

 P.); near top of loess, mounds common. South, north 

 and west sides. Many seeds produced. Not all the plants 

 which flower produce seeds — many empty stalks were 

 found. It is a significant fact that this species does 



