414 



PASTURAGE AND OVEKSTOCKING. 



Fig. 174. 



ASCLEPIAS TUBEEOSA. PLEUSISY HOOT. 



Fig. 175. 

 ASCLEPIAS SYHIACA. 



South, 



plant), Veronicas, Yellow Jessamine of the 

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



Asclepiadaceae -.—The common .Milk- 

 weed (Fig. 175), or Silkweed, Aselepias 

 comuti, is much frequented hy bees, 

 but these visits are often fatal to tliem. 

 All the grains of pollen of the Silkweed, 

 in each antherj are collected in a com- 

 pact mass, ~ inelp'sed in a sack; these 

 sacks are united in pail's (a. Fig. 176) 

 by a kind of thread, terminated by a 

 small, viscous gland. These threads „ „ , „ ■ 



o-j sacs of pollen in 

 stick to the feet. (6. Fig. 176) and often Pairs ; 6, the same at- 



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 Western Illinois, a variety of the 

 common kind, the Aselepias 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. 



POLLEN OP MILKWEED. 



