stout: pollinations in cichorium intybus 



367 



the self-sterility in chicory. Neither are there in Cichorium any 

 apparent anatomical differences in the flower parts that would 

 constitute a factor in the question of fertility. The type of 

 flower is quite identical in all cases and the pistils and the 

 stamens are the same in position, and of the same relative 

 length both on a single plant and on various plants. All the 

 flowers with the exception of an occasional stray tubular flower 

 are ligulate and are quite identical in respect to general structure. 

 That the sex organs of self-sterile plants are effective for repro- 

 duction under certain conditions is conclusively shown when 

 crosses are made between plants that are self-sterile. As shown in 

 table 2 the pollen of the plants A, B, and C, which was ineffective 

 in selfing, was productive of seed when used in cross-pollination. 

 In this and in succeeding tables there is given the number of 

 different dates on which the pollinations were made (under 

 Dates), the total number of heads involved, the number of heads 

 in which no seed were produced, the number of heads in which 

 seeds were produced, and the enumeration of the seeds obtained 

 for each head. Later tables include additional data which will 

 be readily understood. In all cases involving crosses the seed 

 parent is placed first in the combination as represented and in the 

 designation of each plant the known ancestry is indicated by the 



numbers used. 



TABLE 2 



Results of successful crosses involving six of the parent plants 



Plants 



A XB.. 

 B XA .. 

 A XC. 

 CXA.. 

 AXE3. 

 Ej XA . 

 A X E22 

 E22 X A 

 E3XC.. 

 CXEj.. 

 C X E22 

 E22 X C 



Record for heads pollinated 



Dates Total 'With no seed With seed 



12 



7 



14 

 II 



Seeds per head 



10 



7 

 II 

 II 



3 

 2 



12 



12 



6 



2 



3 

 6 



2, 3, 4, 6, 7. 7, 10, 10, II, 15 

 2, 3, 6, 8, ID, 14, 17 



2, 6, 7, 7, 8, 8, 14, 15, 17, 18 



3, II, II, 12, 14, 14, 16, 16, 19, 19, 20 



9, 14, 15 

 6,9 



5, 6, 7, 8, 10, 13, 13, 14, 14, 15, 15, 17 



6, 6, 6, 7, 10, 12, 14, 14, 15, 15, 17, 17 

 6, 8, 12, 15, 16, 18 



8, 14 



II, 15. 19 



3, 3, 5, 5. 15. 18 



The crosses given in table 2 which involve plants of the E 

 series were made in 191 2 and no exact record was kept of the 

 number of heads that were pollinated, as at that time it was not 



