236 STATE HORTICULTURAL SOCIETY 



3088. C. liillii, (Canby) Porter. 'Hill's Thistle. 

 On rich prairies ; not common. 



3089. C. muticus, (Michx.) Pers. Swamp Thistle. 

 Common in bogs. 



3090. C. arvensis, (L.) Robs. Canada Thistle. 



An introduced weed ; fortunately not common. 



Twenty-five species added under letters. Total number 

 species mentioned 3,115. 



