620 



Journal of Agricultural Research 



Vol. XII, No. lo 



derived from the pistillate forms continuing pollen development in the 

 staminoids beyond the usual time or whether they are staminate forms 

 in which pollen development is inhibited has not been determined ex- 

 perimentally. However, they appear to be of the latter type as they 

 have been seen in flower a number of times and have shown no signs of 

 setting fruit. 



RELATION OF FLOWER 

 PART NUMBER TO 

 SIZE OF FRUIT 



It is generally rec- 

 ognized by growers 

 that toward the end 

 of and in fact during 

 the whole progression 

 of the picking season 

 of strawberries, there 

 is a progressive de- 

 crease in the size of 

 berries produced, but 

 the relationship be- 

 tween this decrease 

 and the position of 

 the flowers on the in- 

 florescence producing 

 these smaller berries 

 has not been so gen- 

 erally recognized. As 

 has already been men- 

 tioned, strawberry 

 flowers are typically 

 pentamerous, but un- 

 der cultivation there 

 has been an increase 

 in the number of 

 parts in a portion of 

 the flowers. This in- 



Fig. 4.— Graphs showing the relation between sepal nmnber and flower cj-g^sg jg mOSt Strfk- 

 position in the seedling varieties No. 373. 968, and 1006. The sepal ... _. 



number is indicated on the abscissas and the frequencies on the ing lU the primary and 



ordinates. sccoudary flowcrs and 



is only apparent to a very slight degree in the later ones. An increase in 

 calyx-lobe number is practically always accompanied by an increase in both 

 petal and epicalyx lobe number and as the stamens are arranged with regard 

 to petal position there is necessarily an increase in stamen number also. 

 Figure 4 shows the relationship between flower position and sepal num- 

 ber in three seedling strawberry varieties. These show a condition typical 



