92 
IOWA ACADEMY OP SCIENCES. 
A. novce-anglice L. Low prairies, frequent. 
A. sericeus Vent. High prairies, frequent. 
A. sJiortii Hook. Prairies, rare. Has the hary petioles of A. 
azureus Lindl. , and the leaves are also slightly pubescent above. 
A. undulatus L. Prairies. J. R. Gardner, coll. Specimen 
not very satisfactory. 
A. cordifolius L. Borders of woods, infrequent. 
A. sagittifolius Willd. Borders and open woods, common. 
A. IcBvis L. Prairies and open woods, common. 
A. multijlorus Ait. Dry prairies, abundant. 
A. diffusus Ait. Low ground, common, 
A. paniculatus Lam. Low ground, abundant. 
A. novi-belgii L. (?) Dr. C. C. Parker, coll. Specimen frag- 
mentary. 
A. prenanthoides Muhl. Low ground, rather rare. 
A. umbellatus Mill. Low woods and prairies, frequent. 
Erigeron canadensis L. Waste ground, abundant. 
E. annuus Pers. Waste ground, common. 
E. strigosus Muhl. Waste ground, frequent. 
E. hellidifolius Muhl. Moist woods, common. 
E. pMladelphicus L. Moist woods, frequent. 
Antennaria plantaginifolia Hook. High woods and prairies, 
common. 
Gnaplialium polycephalum Michx. Fields and open woods, 
frequent. 
Polymnia canadensis L. Shaded moist places, infrequent. 
Silphium laciniatum L. Prairies, common. 
8. integrifolium Michx. Low prairies and open woods, fre- 
quent. 
S. perfoliatum L. Along streams, infrequent. 
Parthenium integrifolium L. Prairies and open woods, com- 
mon. 
Ambrosia trifida L. Moist ground, common. 
A. trifida L , var. integrifolia (Muhl.) Torr. and Gray. With 
the last or in dry places, infrequent. 
A, artemisicefolia L. Waste ground, abundant. 
A. psilostachya D. C. Waste ground, only two small patches 
known here. 
Xanthium canadense Mill. Waste ground, frequent. 
Heliopsis scabra Dunal. Prairies, frequent. 
Echinacea augustifolia DC. Prairies, frequent. 
Rudbeckia laciniata L. Low ground, common. 
