IOWA ACADEMY OF SCIENCES. 
93 
B. triloba L. Dry prairies, common. 
R. subtomentosa Pursh. Prairies, infrequent. Dr. C. C. 
Parker, coll. 
R. Mrta L. Prairies, frequent. 
Lepachys pinnata Torr. and Gray. Prairies, common. 
Helianthus annuus L. Waste ground, infrequent. 
E. rigidus Desf. Prairies, frequent. 
E. occidentalis Riddell. Prairies, common. 
E. Icetijlorus Pers. Prairies, rare. Dr. C. C. Parker, coll. 
E. grosse-serratus Martens. Prairies, frequent. One plant 
placed here after comparison must be a very unusual form, or a 
different species; others are the usual form. 
E. giganteus L. Low ground, rare. 
E. giganteus L, var. ambiguus Torr. and Gray. Prairies, 
frequent. The plant may be E. maximiliani Shrad. instead. 
E. divaricat'us L. (?) Dr. C. C. Parker, coll. Specimen not 
certain. 
E^. hirsutus Raf. Dry prairies, frequent. 
E. strumosus L. Low ground, frequent. 
E, tracheliifolius Willd. Low thickets, rare. 
E. tuberosus L. Prairies and borders, frequent. 
Coreopsis palmota Nutt. Prairies, common. 
Bidens frondosa L. Low ground, abundant. 
B. connata Muhl. Wet ground, common. 
B. connata Muhl. , var. comosa Gray. With the last, frequent. 
B. cernua L. Wet ground, probably common. Dr. C. C. 
Parker, coll. 
B. chrysanthemoides Michx. Wet ground, frequent. 
Eelenium autumnale L. Moist ground, common. 
Anthemis cotula L. Waste ground, abundant. 
Achillea millefoliun L. Prairies, common. 
Tanacetum vulgar e L. Occasionally escaped. 
Artemisia caudata Michx. Sandy soil, common. 
A. dracunculoides Pursh. Sandy river banks, infrequent. 
A. serrata Nutt. Low prairie, rare. 
A. ludoviciana Nutt. Prairie, common and variable. 
A. biennis Willd. Sandy soil, rare. Dr. C. C. Parker, coll. 
A. absinthium L. Rarely escaped. Dr. C. C. Parker, coll. 
Senecio aureus L. Low ground, common. 
S. aureus 'Ll. ^ balsamitce (Muhl.) Tarr. and Gray. With 
the last, probably rare. 
Cacalia suaveolens L. Borders of woods, infrequent. 
