FLOWERING PLANTS AND FEKNS OF INDIANA. 881 



cannabinum L. Indian Hemp. 



In fields and thickets, of wider distribution and more abundant 

 than the preceding. It is frequently a very attractive plant in 

 dry, open fields, where in some localities it is the dominant plant 

 form. 



Flowers from July to September. 



Tippecanoe (Cunningham); Daviess (Clements); Cass and 

 Fayette (Hessler); Vermillion (Wright); Jefferson and Kosciusko 

 (Coulter); Vigo (Blatchley); Hamilton and Marion (Wilson): 

 Steuben (Bradner). 



ASCLEPIADACE.E. Milkweed Family. 



ASCLEPIAS l. 



A. tuberosa L. Butterfly Weed. Pleurisy Root. 



One of the most brilliant of the genus in our bounds. Widely 

 distributed and very abundant. It is found in dry soil, sandy or 

 gravelly, and at times gives character to miles and miles of rail- 

 road embankments. 



Begins flowering in June, but the mass flowering being in 

 August. 



Clark (Baird and Taylor); Dearborn (Collins); Daviess (Cle- 

 ments); Jay, Delaware, Randolph, and Wayne (Phinney); Frank- 

 lin (Meyncke); Gibson and Posey (Schneck); Jefferson (J. M. 

 Coulter); Xoble (Van Gorder); Owen (MacDougal); Tippecanoe 

 (Cunningham); Vigo (Blatchley); Kosciusko (Coulter); Hamilton 

 (Wilson); Steuben (Bradner); Cass and Marshall (Hessler). 



A. purpurascens L. Purple Milkweed. 



Found in many counties in dry fields and thickets, and along 

 roadsides. Frequently associated with A. tuberosa. The form is 

 very difficult at times to separate from the preceding, almost per- 

 fect intergradations occurring where the species grow together 

 over large areas. 



Flowering season July to October. 



Daviess (Clements); Vigo (Blatchley); Jay, Delaware, Ran- 

 dolph and Wayne (Phinney); Xoble (Van Gorder); Clark (Baird 

 and Taylor); Gibson and Posey (Schneck); Franklin (Meyncke): 

 Hamilton (Wilson); Kosciusko (Coulter). 



