190 
IOWA ACADEMY OF SCIENCES. 
Primulace^. 
Steironema ciliatum 'Rdd. Fremont county. Woods; frequent. 
S. lanceolatum Gray. Ringgold county. Frequent dn a 
swampy locality. 
Apocynace^. 
Apoc%jnum androsaemifolium L. Union county. Waysides 
and fields; frequent. 
A. cannabinum L. Clarke, Montgomery, Pottawattamie, 
Ringgold, and Taylor counties. Fields and waste places; fre- 
quent. 
Asclepiadace^. 
Asclepias tuberosa L. Clarke, Union, Montgomery, Ring- 
gold, Taylor, and Page counties. Fields; common. 
A. incarnata L. Ringgold, Page, and Fremont counties. 
Wet soil; frequent. 
A. cornuti 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. sullivantii Englm. Taylor and Page counties. Bottoms; 
frequent. 
A. obtusifolia Mx. Union, Adams, and Montgomery counties. 
Waysides; frequent. 
A, meadii Torr. Adams county. Prairie; infrequent. 
A. purpurascens L. Union and Ringgold counties. Infre- 
quent. 
A. verticillata L. Ringgold, Taylor, Page, Fremont, and 
Pottawattamie counties. Fields and open woods; common. 
Acerates longi folia Ell. Ringgold and Taylor counties. 
Prairies; common. 
A viridiflora Ell. Clarke county. Prairies; frequent. 
Gentianace^. 
Gentiana andreiusii Griseb. Decatur county. Prairies; 
infrequent. 
G. alba Muhl. Taylor county. Prairie woods; infrequent. 
POLEMONIACE^. 
Phlox pilosa L. Union, Adams, Montgomery, and Pottawat- 
tamie counties. Prairies; common. 
P. divaricata L. Pottawattamie county. Rich woods; 
common. 
