VARIATION IN THE RAY FLOWERS OF 

 THE COMMON CONE FLOWER 

 {RUDBECKIA HIRTA). 



F. C. LUCAS. 



The following observations concerning the variation in the 

 ay flower of the common cone-flower or brown-eyed Susan 

 /ere made during the summer of 1902. 



Lot No. I.— 318 heads. From prairies near what is known 

 s the Stickney tract (Chicago, III). Soil clayey, ground rather 



moist. Collected July 7th. These heads were picked at random 

 from a large patch. Fig. i . . 



Lot No 2 - 225 heads. Collected from the same region and 

 at the same time as those of lot No. i. In this case, however, 

 56 different plants were pulled and all the flowers on each were 

 included in the count. Fig. 2. 



Lot No. 3.- 240 heads. From the prairies two m.les d.rectl) 



