194 



The Plant World. 



TABLE III COMPARIXG PLANTS IN OPEN AND SHADE. 



Total nviinber of plants counted 



Total number of stems counted 



Total numlier of flowers counted 



*Average numl)er of stems to a plant . . 



Per cent of stems bearing no bloom 



Per cent of stems bearing bloom 



Per cent of stems bearing two flowers . . 

 Per cent of stems bearing one flower . . . 

 Per cent of stems bearing three flowers. . 

 Per cent of last year's pods to this year's 

 flowers 



In open J In shade 



91 



58 58 



22 



*Not a fair conclusion for the whole population, because many sin- 

 gle stems and smaller grouj)? in the open were not counted. 



Table III brings out quite strikingly the differences of 

 growth due to amount and intensity of sunhght to which the 

 plant is exposed. Those growing in shaded situations (although 

 the flowers are more deeply colored) bear hardly more than half 

 as many flowers as those growing in the open, the percentage 

 of barren stalks is over six times as great, and the profusion of 

 flowers to a single stem is markedly less. No measurements 

 were taken as to height, but my opinion is, that the shaded 

 plants would average several inches taller. 



Bees of the genus Andrcna were found to be the customary 

 agents for effecting fertilization in this species. As they work 

 during the warm sunny hours, and would naturally frequent 

 most the more conspicuous and accessible flowers growing in 

 the open glades, the fact that over half the flowers in the open 

 set seed, while only a little more than one-fifth of those among 

 the cedars do so, would seem significant as evidence that An- 

 drena is the pollinating agent for this plant. 

 Cornell Lniversity, 



Ithaca, New York. 



