6 Trans. Acad. Sci. of St. Louis. 



S. speciosa angustata, T. & G. Crown consisting of base 

 of old stems. Prairie. 



S. Missou7'iensis, Nutt. Slender rhizomes. Prairie. 



S. serotina, Ait. Slender rhizomes. Thickets, fence- row3 

 and moist open ground. 



S. Canadensis, L. Khizoraes stouter than the preceding. 

 In similar situations to the preceding and more or less on 

 prairie. 



S. nemoralis, Ait. Loose crown of stem bases. Prairie 

 and sterile soil. 



/S. rigida, L. Close crown of stem bases. Prairie and 

 sterile or stony hills. 



iS. lanceolata , L. Rhizomes. Moist soil. 



Asler oblongifolius rigidulus, Gray. Rhizomes. Prairie 

 and sterile hills. 



A. sericeus, Vent. Small compact crown. Prairie and 

 stony hills. 



A. azureus, Lindl. Loose crown. Often forming rosettes 

 of leaves in fall. Open woods and along the edges of woods. 



A. Drummondii, Lindl. Loose crown of stem bases. Often 

 producing rosettes of cordate leaves in the fall. Open woods. 



A. laevis, L. Loose crown similar to preceding. Similar 

 situations to A. azureus. 



A. muUifloj'Us, Ait. Rhizomes. Prairie. 



A. paniculatus, Lam. Rhizomes. Moist places. 



Erigeron Canadensis, L. Annual. Waste places and open 

 woodland. 



E. divaricatus, Michx. Annual. Prairie. 



E. strigosusy Muhl. Annual or biennial (winter annual). 

 Prairie. 



Antennaria plantagini/olia, Hook. Stolons. Dry open 

 woods. 



A. campesiris, Rydb. Stolons. Prairie. 



Gnaphaliiwi poli/cephalum, Michx. Annual. Sandy fields. 



Silphium laciniatum, L. Thick branched rhizome sup- 

 ported by an equally thick root forming an open crown. 

 Prairie and stony hills. 



S. integrifoUum, Michx. Open crown of half-inch -thick 

 stems forming rosettes in fall. Prairie and thickets. 



