PLANTS OF IOWA 235 



MESADENIS, Raf . 



3073. M. reniformis, (Muhl.) Raf. Great Indian Plantain. 

 Quite common, in woods. 



3074. M. atriplicifolia, (L.) Raf. Pale Indian Plantain. 

 In rich soil; rare. 



3075. M. tuberosa, (Nutt.) Britton. Tuberous Indian 



Plantain. 



In moist places ; not common. 

 SYNOSMA, Raf. 



3076. 8. suaveolens, (L.) Raf. Sweet-scented Indian Plantain. 

 In rich woods ; rare. 



SENECIO, L. 



3077. 8. atriapiculatus, Rydb. Black-seeded Groundsel. 

 In moist soil. 



3078. 8. balsamitce, Muhl. Balsam Groundsel. 

 In dry places; common. 



3079. 8. aureus, L. Swamp Squaw-weed. 

 In bogs; not rare. 



3080. 8. palustris, (L.) Hook. Marsh Fleawort. 

 In wet ground. 



3081. 8. obovatus, Muhl. Round-leaf Squaw-weed. 

 On wet banks. 



ARCTIUM, L. 



3082. A. lappa, L. Great Burdock. 

 Introduced weed from Europe. 



3083. A. minus, Schk. Common Burdock. 

 Common introduced weed. 



CARDUUS, L. 



3084. C. lanceolatus, L. Common Field Thistle. 

 Introduced weed; common. 



3085. C. altissimus, L. TaU Thistle. 

 Common in thickets. 



3086. C. discolor, Muhl. Field Thistle. 

 Common along borders. 



3087. C. undulatus, Nutt. Wavy-leaved Thistle. 

 On prairies. 



