984 



COMPOSITAE 



Bidens 



5. Bidens discoidea (T. &. G.) Britt. Map 2153. Infrequent throughout 

 the lake area and probably local in the remainder of the state. Most of my 

 specimens grew on old logs in dried-up swamps. The species is generally 

 found on the borders of dried-up swamps, in wet woods, and on the 

 borders of lakes. 



N. S., s. Que. to Minn., southw. to Va., Ohio, La., and Tex. 



6. Bidens coronata (L.) Britt. {Bidens trichosperma (Michx.) Britt.) 

 Map 2154. Fernald (Rhodora 40: 348-351. 1938) has divided this species 

 into four varieties. His publication came too late for me to study our 

 Indiana specimens, although I find we have both the typical form and 

 var. tenuiloba (Gray) Sherff. Frequent in the lake area and local south- 

 ward. In the lake area before drainage it sometimes covered acres of marsh 

 land and was the source of "Spanish Needle" honey. Where it is found, it 

 usually forms dense colonies. Its habitat is in marsh land, tamarack bogs, 

 springy places, and low places along streams and ditches. Very narrow- 

 leaved forms are regarded by some authors as belonging to a variety, but 

 1 have not recognized this vegetative fluctuation. 



Mass. to Minn., southw. to Ga., and Ky. 



7. Bidens aristosa (Michx.) Britt. Map 2155. This is a western species 

 that has invaded the western part of the state. My Hancock County speci- 

 men was found along a railroad. Our specimens are from low roadsides 

 and are mostly from low, fallow fields which have a hard, white, clay soil. 



Maine to Minn., southw. to Va., Mo., and s. Tex. 



7a. Bidens aristosa var. Fritcheyi Fern. (Rhodora 15: 78. 1913.) Map 

 2156. Our specimens of this species are all from moist roadsides. 

 Ind. and Ky., westw. to 111. and Mo. 



7b. Bidens aristosa var. mutica Gray ex Gattinger. (Rhodora 15: 78. 

 1913.) Map 2157. In wet prairie habitats and along the Kankakee River in 



