Asclepias 



ASCLEPIADACEAE 



767 



50 



Map 1647 



Asclepias Meadn Torr. 



o 50 



Map 1648 



Asclepias amplexicaulis J.E.Smith 



o 50 



Map 1649 



Asclepias Sullivantn Engelm 



mostly along roadsides and railroads, becoming rarer southward. In the 

 southern part of the state it is found on washed slopes, sandy, wooded 

 ridges, along roadsides in clay or on sand hills, and in the hard, clay 

 flats. In 1935 I noted this species to be abundant in the old Beaver Lake 

 bottom in Newton County. 



Maine, Ont. to Sask., south w. to Fla. and Mex. 



2. Asclepias tuberosa L. Butterflyweed. Pleurisy Root. Map 1646. 

 Infrequent throughout the state except in the sandy areas of the lake 

 region where it becomes frequent. It is usually found on dry, sandy, road- 

 side knolls, or in dry, sandy, open woodland and in moist or dry, sandy 

 prairies. 



This species is variable in habit, sometimes almost erect, usually some- 

 what ascending, or rarely almost decumbent. It is also variable in the 

 number, position, and shape of the leaves on the stem. The stem divides 

 at the top, usually into 2-5 parts, these sometimes much elongated and 

 spreading, and each bearing 1-5 umbels of flowers. 



N. H. to Minn., southw. to Fla., Tex., and Ariz. 



2a. Asclepias tuberosa f. bicolor Standley. (Rhodora 32: 33. 1930.) 

 This is a color form from Porter County recently described by Standley. 



In it the corolla is bright yellow and the remainder of the flower is 

 generally orange. 



3. Asclepias Meadii Torr. Mead Milkweed. Map 1647. The only 

 record from Indiana is that of a specimen collected July 3, 1888, in dry 

 ground near Crown Point, Lake County, by Dr. M. A. Brannon. This speci- 

 men came into the hands of S. C. Wadmond of Delavan, Wisconsin, who 

 was generous enough to donate it to me. This species is either very rare 

 or not recognized by collectors. 



Ind. to Iowa and Wis. 



4. Asclepias amplexicaulis J. E. Smith. Map 1648. In the lake area 

 this milkweed is found in very sandy soil on roadside knolls, in very sandy, 



