414 



PASTURAGE AND OVERSTOCKING. 



Fig. 174. 



ASCLEPIAS TUBEROSA. PLEVRISY ROOT. 



Fig. 175. 

 ASCLEPIAS SYRIACA. 



plant), Veronicas, Yellow Jessamine of the South, 

 whose honej'^ 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 

 small, viscous gland. These threads 

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



tarhed to a bees foot. 



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

 cannot easily get rid of them, and perish. 

 In some parts of Ohio and Westei-n Illinois, a variety of the 

 common kind, the Asclepias Sullivantii, does not present to 

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

 gathering honey freely on four or five different varieties 

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



Fig. 176. 



POLLEX OF MILKWEED. 



a, sacs of pollen in 



