414 MINNESOTA BOTANICAL STUDIES. 



Bidens laevis (L.) B.S.P. Prel. Cat. N. Y. 29. 1888. 



Coll. : Wheeler 560, Jefferson. Aug. 

 Bidens comosa (A. Gray) Wiegand, Bull. Torr. Club, 24: 

 436. 1897. 



Coll. : Wheeler 544, 559, Jefferson ; 628, Brownsville. Aug. 

 Not previously reported from Minnesota. The only pre- 

 viously collected authentic specimen seen from Minnesota 



is that of Aiton, Minneapolis, Sept., 1890. 

 Common on the low wet ground throughout. 

 Bidens frondosa L. Sp. PL 832. 1753. 



Coll. : Wheeler 541, Jefferson. Aug. 

 Helenium autumnale L. Sp. PI. 886. 1753. 



Coll.: Wheeler 487, Jefferson. Aug. 

 Achillea millefolium L. Sp. PI. 899. 1753. 



Coll. : Wheeler 398, Jefferson. July. 

 Anthemis cotula L. Sp. PI. 894. 1753. 



Coll. : Lvon 269, 284, Jefferson. July. 

 Chrysanthemum leucanthemum L. Sp. PI. 888. 1753. 



Coll. : Lvon 231, Crooked Creek. July. 

 Tanacetum vulgare L. Sp. PI. 844. 1753. 



Coll. : Lyon 416, Winnebago. Aug. 

 Artemisia dracunculoides Pursh, F1. Am. Sept. 742. 18 14. 



Coll.: Wheeler 370, Crooked Creek; Lyon 369, 390, 

 Jefferson. Aug. 

 Artemisia serrata NuTT. Gen. 2: 142. 1818. 



Coll.: Lyon 383, Jefferson. Aug. 

 Artemisia gnaphalodes Nutt. Gen. 2: 143. 1818. 



Coll.: Wheeler 550, Jefferson; Lyon 419, Winnebago. 

 Aug. 

 Erechtites hieracifolia (L.) Raf. DC. Prodr. 6: 294. 1837. 



Coll.: Lyon 342, 446, Jefferson; Wheeler 621, Browns- 

 ville. Aug. 

 Mesadenia reniformis (Muhl.) Raf. New Fl. 4: 79. 1836. 



Coll. : Wheeler 273, Crooked Creek. June. 

 Senecio plattensis Nutt. Trans. Am. Phil. Soc. (IL) 7: 413. 

 1841. 



Coll. : Wheeler 100, Winnebago. June. 

 Not previously reported from Minnesota. The only previous 



known collection in this state is that of Prof. Conway 



MacMillan from Hennepin county. 



