Lactuca 



Compositae 



1011 



TO 



Map 2221 

 Lactuca canadensis 

 var latifoha KunUe 



o~ ~To 

 Map 2222 

 Lactuca canadensis 

 var integrifolia (Bigel) Gray 



3. Lactuca saligna L. Map 2219. Local but abundant where it is 

 found. No doubt it has a wider distribution than our map indicates. It 

 prefers a sandy soil and in such a habitat it is a common weed in ballast 

 for miles along railroads. Found along railroads and roadsides and waste 

 places and pastures. 



Nat. of Eu. ; I have not been able to ascertain its distribution in the 

 U. S. although it is definitely reported from Ohio, Mich., Mo., and Calif. 



4. Lactuca canadensis L. var. typica Wieg. (Rhodora 22: 10. 1920.) 

 (Lactuca canadensis L. in part.) Map 2220. Infrequent to frequent in dry, 

 open woodland throughout the state; also along railroads and rarely in 

 fallow fields. Wiegand describes also f. angustipes of this variety which I 

 have not seen in Indiana. 



N. S. to B. C, southw. to Ga., Ala., La., Ark., and Colo. 



4a. Lactuca canadensis var. Iatifolia O. Ktze. (Rhodora 22: 10. 1920.) 

 (Lactuca canadensis L. in part.) Map 2221. Infrequent to frequent 

 throughout the state although I do not have a specimen from the dune 

 area. It is found chiefly in moist or dry, open woodland and occasionally 

 along roadsides and railroads. 



Wiegand describes also f. exaurieidata of this variety with leaves which 

 are not sagittate at the base. I have not seen it in Indiana. 



T. E. I. to Wis., southw. to Fla. and Okla. 



4b. Lactuca canadensis var. integrifolia (Bigel.) Gray. (Rhodora 22: 

 10.1920.) (Lactuca sagitti folia Ell.) Map 2222. Infrequent to frequent in 

 moist or dry, open woodland in the southern part of the state. I have only 

 a few specimens from the northern part. It is also found along roadsides 

 and fences. 



P. E. I. to Wis., southw. to Ga., 111., Okla., and Nebr. 



4c. Lactuca canadensis var. integrifolia f angustata Wieg. (Rhodora 



