Bidens 



Compositae 



983 



50 



Map 2152 



Bidens bipmnata L. 



Jan 

 Feb. 

 Mar 

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May 



June 



July 



Aug 



Sept 



Oct 



Nov 



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Miles 



50 



Map 2153 

 Bidens discoidea (T. & G.) Britt 



south of the lake area. It is found in wet places in marshes, in bogs and 

 ditches, and on the borders of lakes, rivers, creeks, ponds, and swamps. On 

 the whole, this species prefers a wetter and more springy habitat than the 

 next two species. The leaves are variable in their shape and in the number 

 and length of the teeth of their margins. Some authors have segregated 

 these variations as varieties but I have not thought them worthy of naming. 

 P. E. I. to Hudson Bay and B. C, southw. to N. C, Mo., and Calif. 



2. Bidens comosa (Gray) Wieg. Map 2149. Probably more or less in- 

 frequent to frequent throughout the state in moist or wet habitats about 

 lakes, along streams and ditches, and on borders of ponds and swamps. 



N. S. to Minn., southw. to N. J., Ky., and Colo. 



3. Bidens connata Muhl. Map 2150. The typical form of this species is 

 apparently rare in Indiana. I have specimens from only Lagrange and 

 Starke Counties. My specimens are from the moist, sandy shores of lakes. 



Que. to Mich., southw. probably to Ga., Mo., and Nebr. 



3a. Bidens connata var. petiolata (Nutt.) Farw. (See Sherff, Mono- 

 graph genus Bidens, p. 257. 1937.) My plants are all from the lake area, 

 although there are reports for it throughout the state. It is found mostly in 

 wet places in woods, dried-up swamps and ponds, and less frequently on 

 the borders of lakes and streams. It must be kept in mind that since the 

 species of Bidens were not well separated by our older manuals, there were 

 many wrong determinations of the species as now understood. 



Range the same as that of the species but more frequent. 



4. Bidens bipinnata L. Spanish Needles. Map 2152. Infrequent 

 throughout the state, although there are no records from the dune area or 

 the extreme northern counties. It is found in both moist and very dry, 

 sandy places. I have never seen it abundant, only once common over a 

 small area, and only once in a cultivated field. All of my specimens are 

 from open woodland and along railroads and canals. 



R. I. to Nebr., southw. to Fla., Kans., and Ariz. 



