85 



fertilized almost exclusively by hianble tmd honey bees. 

 Five or six honey bees may sometimes be found in a single 

 |)um[)kin flower, scrambling over each other. 



Oenolhera biennis by bumble bees and other bees, a i)ink- 

 and-white moth and another of a dusky color. 



Irn2)atiens fulva is visited by bumble bees who I)oth enter 

 at the orifice and afterwards bite holes in the shar[)-turned, 

 fish-hook spur from the outside, to get every droj) ! also 

 by hunmiing birds. 



IL/l^ericiim and Hypoxia rarely have insect visitors ; a few 

 honey bees oidy have been seen on Hypoxis. 



Ribes aureum, yellow, with a long calyx-tul)e, is visited 

 by bumble bees. 



Linaria vulgaris, yellow, is visited exclusively by bumble 

 bees and another small bee. 



Silpliium asjierrinifun and lleliopsis scabra are two i)lants 

 of about the same height, with yellow fioweis, similar in 

 appearance. The former is visited by many bumble bees, 

 while Heli()j)sis has none. The florets of Silphium were 

 longer and looser ; those of Heliopsis shorter and more 

 compact ; these were the only visible differences. Heliopsis 

 was not entirely forsaken by insects, however, for it had 

 several kinds but smaller in size. 



Sassafras has small greenish-yellow flowers visited by 

 flies and ants. Bees do not visit ihem. If they alight 

 casually and taste the nectar, they innnediately leave in 

 disgust. 



Tilia, on the other hand, of a similar color but even 

 paler, has throngs of bees and other insects which all to- 

 gether make a distinct hunmiing sound I 



Oakesia sessilifolia is of a dull cream color, flowers droop- 

 ing, under overspreading leaves. The flower is often 

 scarcely visible, and yet bumble bees will fly close to the 

 ground, passing violets, potentilla, strawberry and other 

 flowers, to find this bonne bouche. 



Bees are also connnonly seen on Helianthus giganteus, 



