60 



secretes honey in two shallow depressions on its inner side, 

 leaving it fully exposed. Above it gives off seven to eigh- 

 teen yellow, knobbed, glandular bodies, probably for the 

 purpose of making the nectaries more conspicuous. These 

 yellow, knobbed affairs look very much like little drops of 

 fluid. Mueller states that these drops are quite deceptive, 

 so much so that flies- are deceived by their appearance. 



Phi adelphus. The flowers are crowded in large, 

 cream-white clusters and are proterogynous. The numerous 

 anthers stand in and around the stigmas before and after de- 

 hiscence and are as long as or longer than the pistils. The nec- 

 tar is secreted in the fleshy disk in the upper part of the 

 ovary. In the absence of cross-pollination, self-pollination 

 can easiljf take place. In is adapted to a large class of visi- 

 tors. An east European species with small flowers is proter- 

 andous. The flowers are sweeter scented, being that of pine 

 apple. 



Ribes The various species of the genus Ribes differ 

 in regard to the depth at which the nectar can be obtained. 

 The Eibes alpium is visited here at Ames by various species, 

 Diptera the common honey bee, and Bombus Pennsyl- 

 vanicus. The Ribas gracile Michx. and R. Cynoabati L- 

 are both early flowering species and are visited by Apis mel- 

 lifica, Bombus Pennsylvardcus- The western Ribes aur- 

 eum Pursh. is frequently cultivated, and has a long calyx 

 tube and small erect petals. The calyx is colored yellow, 

 petals also yellow, flowers very fragrant. The petals, after 

 fertilization change from yellow to bright red. It is adapt- 

 ed to long-tongued bumble bees. 



Loosestrife, I/ythrum Salicaria L. is a 

 native of Europe but sparingly naturalized 



