414 



PASTURAGE AXD 0\ EKSTUCKING. 



Fig. 174. 

 ASCLEPIAS TUBEEOSA. PLETJEISY BOOT. 



Fig. 175. 

 ASCLEPIAS SYKIACA. 



South, 



plant), Veronicas, Yellow Jessamine of the 

 whose honej' is poisonous. — (Dr. J. P. H. Brown.) 



Asdepiadaceae : — 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. Tig. 176) 

 by a kind of thread, terminated by a 



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



' ^ a, sacs of pollen m 



stick to the feet. (&. Fig. 176) and often pairs; 6, 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 Sullivanlii, does not jiresent 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 or MILKWEED. 



