414 



PASTURAGE AND OVEKSTOCKING. 



Fig. 174. 



ASCLEPIAS TUBEHOSA. PLEURISY ROOT. 



Fig. 175. 

 ASCLEPIAS SYRIACA. 



plant), Veronicas, Yellow Jessamine of the South, 

 whose honey is poisonous. — (Dr. J. P. H. Brown. 



Asclepiadaceae: — The common Milk- 

 weed (Fig. 175), or Silkweed, Asclepias 

 cornuti, is much frequented by bees, 

 but these visits are often fatal to them. 

 All the grains of pollen of the Silkweed, 

 in each anther, are collected in a com- 

 pact mass, inclosed in a sack; these 

 sacks are united in pairs (a. Fig. 176) 

 by a kind of thread, terminated by a ^'s. 176. 



n • _1 J mi J.1 J POLLEN OF MILKWEED. 



small, viscous gland. These threads „ . „ 



' ° o-, sacs of pollen m 



stick to the feet. (b. Fig. 176) and often Pa'rs; h, the same at- 



to the labial palpi (46) of the bees, who (From "A b c ot Bee- 



cannot easily get rid of them, and perish. " "'^^' 



In some parts of Ohio and Western Illinois, a variety of the 



common kind, the Asclepias Sullivantii, does not present to 



bees these difficulties to the same degree. TTe have seen bees 



gathering honey freely on four or Ave different varieties 



which grow in our neighborhood, and especially on the Tube- 



