768 



ASCLEPIADACEAE 



Asclepias 



fallow fields, and in prairie habitats. In the southern part of the state 

 it is found in similar habitats and on the crests of sandstone ridges in 

 open woodland, and very rarely in hard, clay soil. Probably entirely absent 

 from many counties of the Tipton Till Plain. 

 N. H. to Fla., westw. to Minn., Nebr., and Tex. 



5. Asclepias Sullivantii Engelm. Smooth Milkweed. Map 1649. 

 Locally frequent in prairie habitats along roadsides and railroads in a few 

 of the western counties. Rarely in other than a prairie habitat. 



5. Ont. to Ohio, westw. to Minn., Nebr., and Kans. 



6. Asclepias incarnata L. Swamp Milkweed. Map 1650. Infrequent 

 to common throughout the state in roadside ditches, along streams and 

 railroads, on the borders of lakes, ponds, and swamps, and in low, open 

 woodland and sometimes in fallow fields. 



N. B. to Sask., southw. to Ga. and Kans. 



7. Asclepias quadrifolia Jacq. Map 1651. Infrequent in the southern 

 part of the state in dry woodland. The reports from northern Indiana are 

 dubious and if it occurs there it is very rare. There are no reports or 

 specimens from the southwestern part of the state. 



N. H. to Ont. and Minn., southw. to N. C. and Ark. 



8. Asclepias perennis Walt. Map 1652. Infrequent in swampy woods, 

 and about sloughs and ponds, mostly in the southwestern counties. 



Ind. to Fla., westw. to Mo. and Tex. 



9. Asclepias variegata L. Map 1653. A rare plant of dry, open wood- 

 land in the southern counties. Usually in sandy to very sandy soil and 

 rarely more than a single specimen in a place. The report by Van Gorder 

 from Noble County may be correct, although I bought his herbarium and 

 found no specimen. 



L. I. to Fla., westw. to Ind. and La. 



