248 IOWA ACADEMY OF SCIENCES. 



545. A. H(>r(r-(ni(//i(t' L. Very common; our largest 



flowered species. 

 546.. A. /(('(is L. very common; leaves very smooth, 



and often glaucous. 



547. .4. serlcexs Vent. Common on dry prairies. A 



very distinct and most beautiful species, with 

 silvery leaves and wiry stems. 



548. A. ptarmicoides (Nees.) Torr and (Jray. Flowers 



white. Rare; six miles west of Estherville on 

 road to Spirit Lake. 



549. A. jirodculafiis Lam. Common on low prairies, 



the leaves resembling those of the Black Wil- 

 low. 



550. A. hiteriforus (L.) Britton. (A. (Jiffasus Ait; A. 



miser Nutt.) Common in open woods. 



551. A. nidltifioiiis Ait. Woods and prairies; very 



common. The flowers, which are very numer- 

 ous, are white or tinged with purple. 

 Erigeron L. 



552. E. phi/ctdslphicds L. Fleabane. Common in low 



ground. 



553. E.' ramosds {Wsi\t.) B. S. P. {E. strir/osus Muhl.) 



Frequent on rather dry prairies. 



Leptilon llaf. 



554. L. canadense {h.) Britton. {Erijp'von canadensis 1j.) 



Horseweed. A very common weed, especially 

 in waste places. 



555. L. dib((ricatii)n (Michx.) Kaf. [Erigeron dirari- 



catuni Michx.) Rare on prairies near Arm- 

 strong. 

 Antennaria Ga^rtn. Everlasting. 



556. A. campestris Rydberg. Very common on prairies. 



557. ^1. plantagini folia (L.) Richards. Open w^oods. 



Both species sometimes called Indians' Tobacco. 



SiLPHIUM L. 



558. S. perfoliatum L. Indian Cup-plant. Frequent in 



woods. 



