952 REPORT OF STATE GEOLOGIST. 



vigorous measures should be taken to prevent its further spread. 



It flowers usually in August and September, occasionally con- 

 tinuing to flower until late in October. 



Tippecanoe (Cunningham); Kosciusko (Coulter); Cass and 

 Fayette (Hessler); Noble (Van Gorder); Putnam (Underwood); 

 Wabash (Jenkins); Hamilton and Marion (Wilson). 



L. Canadensis L. Wild Lettuce. 



Very abundant in almost every part of the State, ordinarily in 

 moist soil. Found in the edges of cultivated fields, by roadsides 

 and in almost any situation where the soil has been recently 

 broken. An annoying weed in many counties. 



Flowers from July until October. 



Tippecanoe (Cunningham); Kosciusko (Coulter); Daviess 

 (Clements); Jefferson (Barnes); Putnam (MacDougal); Noble 

 (Van Gorder); Clark (Baird and Taylor); Franklin (Meyncke); 

 Gibson and Posey (Schneck); Jay, Delaware, Randolph, and 

 Wayne (Phinney); Decatur and Shelby (Ballard); Fayette (Hess- 

 ler); Hamilton and Marion (Wilson); Steuben (Bradner). 



L. hirsuta Muhl. Hairy Wood Lettuce. 



Found only in the southern counties of the State in dry soil. 

 Not abundant. Stem and peduncles very often red or purple. 



Flowers in July and August. 



Vigo (Blatchley); Gibson and Posey (Schneck); Clark (Baird 

 and Taylor). 



L. sagittifolia Ell. Arrow-leaved Lettuce. 

 (L. integrifolia Bigel.) 



In many counties in dry, open rather sandy soil in fair abun- 

 dance. More abundant in the southern than in the northern 

 counties. 



Flowers from July until September. 



Noble (Van Gorder); Franklin (Meyncke); Jefferson (J. M. 

 (Coulter); Clark (Baird and Taylor); Gibson and Posey 

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

 Daviess (Clements); Putnam (MacDougal); Fayette (Hessler). 



L. pulchelia (Pursh) DC. Large Blue-flowered Lettuce. 



Evidently a migrant. Reported from a single station in the 

 State by Dr. MacDougal. Found in moist soil along the right 

 of way of a railroad. 



Collected in flower in August. 



Putnam (MacDougal). 



