FLOWERING PLANTS AND FERNS OF INDIANA. 957 



us a prevalent if not a pernicious weed. The pollen of the plant 

 is popularly supposed to cause hay fever. 



Flowering season, from July through October. 



Jefferson (Barnes); Monroe and Vigo (Blatchley); Fayette 

 (Hessler); Daviess (Clements); Clark (Baird and Taylor); Jay, 

 Delaware, Eandolph, and Wayne (Phinney); Dearborn (Collins); 

 Franklin (Meyncke); Gibson and Posey (Schneck); Noble (Van 

 Gorder); Putnam (MacDougal); Tippecanoe (Cunningham); Kos- 

 ciusko (Coulter); Wabash (Jenkins); Hamilton and Marion (Wil- 

 son); Steuben (Bradner). 



A. PSiLOSTACHYA DC. Western Ragweed. 



Eeported as a member of the State flora by Dr. Robert Hessler. 

 Abundant herbarium specimens verify the reference. The gen- 

 eral distribution of the plant is to the west of our range. It 

 probably entered the State along the line of east and west rail- 

 roads. It is as yet a local form of no general distribution. 

 Usually in moist soils. 



Flowers from July through September. 



Marshall and Marion (Hessler). 



XANTHIUM L. 



X. spinosum L. Spiny Cocklebur. Burweed. 



In the southern and central counties of the State, not extend- 

 ing north of Putnam County. Quite abundant in the extreme 

 southern part of the State in waste places and along roadsides. 



Flowers from August until November. 



Jefferson (Barnes); Putnam (MacDougal); Clark (Baird and 

 Taylor); Franklin (Meyncke). 



X. strumarium L. Cocklebur. Bur-thistle. 



In all parts of the State, abundant in alluvial soils and culti- 

 vated fields. A very persistent and annoying weed, which seems 

 to increase in numbers with the increase in the killed area. 



Flowers in August and September. 



Vigo and Monroe (Blatchley); Fayette (Hessler); Dearborn 

 (Collins); Jay, Delaware, Randolph, and Wayne (Phinney); 

 Franklin (Meyncke); Gibson and Posey (Schneck); Jefferson (.1. 

 M. Coulter); Putnam (MacDougal); Hamilton and Marion (Wil- 

 son); Steuben (Bradner). 



