IOWA ACADEMY OP SCIENCES. 133 



SALICACEyE. 



Salix humilis Marsh. 



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

 (L. H. P.). 

 S. longifolia Muhl. 



Sioux City (B. W.). 

 Pojndus 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^. 

 CeratopJiyUicm demersum L. 

 Sioux City (B.W.). 



CONIFERiE. 

 Junijjerus Virginiana L. 

 Sioux City (B. W.). 



ORCHIDACE^. 

 Orchis spectabilis L. 



Sioux City (B. W.). 

 Eabenaria leucophcea Gray. 



Cherokee (B. W.). 

 Spiranthes cernua Richard. 



Smithland (B. W.). 

 Cypripediuin lyubescens Willd. 



Cnerokee, Smithland (B. W.). 



IRDIACE^. 

 Iris versicolor L. 



Sioux City (B. W.). 



LILIACE.^. 

 Smilax herhacea D. 



Sioux City (B. W.). 

 Allium stellatum Fras. 



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

 A. Canaclense 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 



