stout: pollinations in cichorium intybus 371 



of ten, but the data compare very favorably with that for such 

 plants as {E3 X A) 710. 6 in which four heads out of thirty-one 

 (proportionally about i out of 8) set some seed. 



The thirty hybrids (series 14) between a plant of the "striped- 

 leaved improved" variety and a plant of the {A X C) hybrids 

 were all completely self-sterile, as is shown in detail in table 8. 



It is very clear, however, that some of these Fi hybrids were quite 

 decidedly self -fertile, and the evidence is likewise strongly indicative 

 that varying degrees of fertility exist, giving plants that are to be 

 considered as feebly self-fertile. 



Self-sterility and self -fertility in F^ progenies derived from seed of 

 self-fertile Fi /^/aw/^.— Pedigreed cultures have been grown from 

 the seed of various of the self-fertile plants just mentioned, and 

 the plants constituting this F2 generation have been selfed during 

 1914 and 1915 as fully as conditions allowed. The results are 

 tabulated in table 4. In this table the designation of the plant 

 gives its pedigree; the portion in parenthesis, as (£j X A), indi- 

 cates the grandparents, the following number is the number of 

 the immediate parent. Under the caption " seeds per head," there 

 are indicated several instances of the removal of seeds from the 

 heads by birds. When there was reason to believe that such 

 heads had contained some good seeds, the record is simply given 

 as B ; when the birds had left some seeds these were collected and 

 the result recorded, as for example, i -f B, or 6 -f B, etc. In 

 this table there is also recorded the color of the flowers as to 

 whether blue (B) or white (W). 



It is especially noticeable that as far as tested the progeny of a 

 self-fertile plant are not all self-fertile. The plant (£j X A) no. 4 

 was decidedly self-fertile (see table 3), but of the 18 plants thus 

 far tested among its progeny 8 were completely self-sterile. The 

 series (£j X A)-6- composed of four plants were all self-sterile. 

 Nineteen offspring of {A X E22)-2- were tested and of these 10 

 were self-sterile; one plant of this series (no. 2) was an abnormal 

 plant with a dwarf habit of growth and nearly all of its flowers were 

 almost completely cleistogamous, with the anthers mostly con- 

 tabescent. Besides being strongly impotent it was self-sterile. 

 The series {A X E22)-4- was composed of 3 self-sterile and 7 

 self-fertile plants, {A X E22)-g- of 4 self-sterile and 2 self-fertile 

 plants, and {E22 X A)-io- of 12 self-sterile and 11 self- fertile. 



