190 IOWA ACADEMY OF SCIENCES. 



Primulace.e. 



Steironema ciliatum Raf. Fremont county. Woods; frequent. 

 S. lanceolatum Gray. Ringgold county. Frequent in a 

 swampy locality. 



Apocynace^. 



Apocynum androsaemlfoHum L. Union county. Waysides 

 and fields; frequent. 



A. cannabinum L. Clarke, Montgomery, Pottawattamie, 

 Ringgold, and Taylor counties. Fields and waste places; fre- 

 quent. 



ASCLEPIADACE.-E. 



Asclepias tKberosa L. Clarke, Union, Montgomery, Ring- 

 gold, Taylor, and Page counties. Fields; common. 



A. incarnafa L. Ringgold, Page, and Fremont counties. 

 Wet soil; frequent. 



A. cornutl Decaisne. Clarke, Adams, Pottawattamie, Ring- 

 gold, and Taylor counties. Fields; common; the authority for 

 this species was wrongly given as DC. in the last report. 



A. suUivantii Englm. Taylor and Page counties. Bottoms; 

 frequent. 



A. obtusifolia Mx. Union, Adams, and Montgomery counties. 

 Waysides; frequent. 



A. meadli Torr. Adams county. Prairie; infrequent. 



A. purjmrascens L. Union and Ringgold counties. Infre- 

 quent. 



A. verticiUata L. Ringgold, Taylor, Page, Fremont, and 

 Pottawattamie counties. Fields and open woods; common. 



Acf rates loncji folia Ell. Ringgold and Taylor counties. 

 Prairies; common. 



A viricUfloi'a Ell. Clarke county. Prairies; frequent. 



GENTIANACE.E. 



Gentiana andreicsii Griseb. Decatur county. Prairies; 

 infrequent. 



(7. alba Muhl. Taylor county. Prairie woods; infrequent. 



POLEMONIACE.E. 



Phlox pilosa L. Union, Adams, Montgomery, and Pottawat- 

 tamie counties. Prairies; common. 



P. divaricata L. Pottawattamie county. Rich woods; 

 common. 



