ASCLEPIADACEAE (MILKWEED FAMILY) 317 



Means of control 



Drainage of the ground is the first step toward the destruction 

 of Swamp Milkweed, after which it needs to be kept closely cut 

 throughout the growing season in order to starve the perennial 

 roots. 



SHOWY MILKWEED 



Asclepias specidsa, Torr. 



Native. Perennial. Propagates by seeds. 



Time of bloom : June to August. 



Seed-time: August to October. 



Range: Minnesota to British Columbia, southward to Arkansas, 



Utah, and California. 

 Habitat : Moist soil ; wet meadows and along streams. 



Plants of this species are sometimes smooth, but usually they 

 are finely white-woolly all over, even to the flowers, of which the 

 calyx is densely so. Stems simple, stout, one to two and a half 

 feet tall. Leaves opposite, thick, broadly ovate to heart-shaped, 

 grayish green, with large veins and short, stout petioles. Umbels 

 many-flowered, the corollas greenish purple, the pedicels and the 

 stout peduncle softly hairy. Follicles plump, three or four inches 

 long, covered with soft, spinous processes, and also densely white- 

 woolly, held erect or slightly spreading on recurved pedicels. 



Means of control 



Drainage of the ground. Uprooting with grubbing-hoe or plow, 

 or such close and persistent cutting as to rob the perennial roots 

 of all sustenance. 



COMMON MILKWEED 

 Asclepias syrlaca, L. 



Other English names: Silkweed, Cottonweed. 



Native. Perennial. Propagates by seeds and by rootstocks. 



Time of bloom : June to August. 



Seed-time: August to October. 



Range: New Brunswick to the Northwest Territory, southward to 



Georgia, Missouri, and Kansas. 

 Habitat: Fields, pastures, roadsides, and waste places. 



