No. 50.] 147 



Bidens, L. Bur Marigold. 



conhata, L. Swamps and low grounds. September. 



frondosa, L. Along fences, &c . August-September. 



cernua, Willd. B. peliolata, Nutt.? Swamps. August-Sept. 



chrysanthemoides, Michx. Low grounds. August— September . 



Beckii, Torr . Lakes and ponds near Schenectady, Dr. Beck. 

 Western part of New-York, Dr. Aikin and Dr. 

 Gray . 



bipinnata, L. Spanish Needles. Fields and rocky hills. August- 

 September . 



Helenium, L. 



autumnale, L. Swamps. August-September. 



Maruta, Cass. 



$ cotula, Cass. Anthemis cotula, L. May-weed, Stinking Cha- 

 momile . Road sides, &c . June-September . 



Achillea, L. Yarrow, Milfoil. 



§ millefolium, L. Fields, pastures, &c. June- August. 



Leucanthemum, Tourn . 



§ vulgare, Lam. Chrysanthemum leucanthemum, L . Ox-eye 

 Daisy. Pastures, &c. June- August. 



Artemisia, L. Wormwood. 



§ vulgaris, L. Mugwort. Fields and road sides. September, 

 canadensis, L. Wild Wormivood. Sandy shores of Lake Erie. 



July-August. Dr. Beck. 

 caudata, Michx. Sandy seacoast of Long Island . September . 



Tanacetum, L. Tansey . 



§ vulgare, L. Common Tansey. Road sides, &c. July- Aug. 



Gnaphalium, L., D. Don. Cudweed. 



decurrens, Ives. Fields and borders of woods . August . 



polycephalum, Miclix. Life Everlasting, Balsam . Old fields, 

 &c. August-September. 



uliginosum, L. Low grounds . July- August . 



purpureum, L. Dry open woods. July. G. sylvaticum, Pursh. 

 (not of Linn.), G. americanum, Pursh. (not of 

 Mill.), and G. pennsylvanicum, Willd. seem not 

 to be distinct from this species . 



