20g Atkinson. 



distinct hybrid types. In the reciprocal cross i. e., when nutans was 

 employed as the mother (nutans X pycnocarpa) three different hybrid 

 types appeared in the first generation. In accordance with de Vries' 

 terminology these would be triplet hybrids. Two of the triplets are 

 identical with the twins obtained from the reciprocal cross, i. e., 

 pycnocarpa X nutans. 



Judging the three types of hybrids from the reaction of the vege- 

 tative characters of the parents which are brought together in the 

 zygote, one hybrid is a blend, while the other two are segregates. 

 When nutans is the mother there is therefore one blend hybrid, and 

 two segregate hybrids. When pycnocarpa is the mother there is one 

 blend and one segregate which are identical with the blend and one 

 segregate of the reciprocal cross. It seems reasonable to expect that 

 if the numbers of the culture were large enough the other segregate 

 would also appear when pycnocarpa is the mother. 



The blend hybrid has flowers with the petals very much like those 

 of nutans (though larger). I have named it hybrida nutella. The segre- 

 gate which has thus far appeared on both sides of the reciprocal crosses 

 has flowers with the petals exactly like those of pycnocarpa, and has 

 been named hybrida pycnella. The other segregate which appears when 

 nutans is the mother has been named hybrida tortuosa from certain 

 features of the rosette stage, while the petals are exactly like those of 

 nutans. The principal characters of these hybrids are as follows, given 

 for the sake of comparison in the same order as those given for the 

 two parent species above: 



Oe. hybrida nutella. Vegetative characters a blend of those of 

 the two parents (Fi blend). Habit, tall, 1— 2 m, lower stem branches 

 numerous, strict but somewhat irregularly spreading, tips reaching above 

 the middle of the main stem and nearly the same level; main stem with 

 high overtop, but intermediate between that of the parents. Autum- 

 nal rosettes compact, larger leaves intermediate in breadth, edge 

 character intermediate between the toothed character of nutans and the 

 cutness o( pycnocarpa, flat, plain, red veined, not repand, with red spots 

 in late autumn. Stems light red, or pink (galer tha.n nutans), tubercles 

 pink. Stem leaves medium^ flat, plain, pink veined. Inflorescence 

 long, rather loose, bracts intermediate between those of the parents, 

 persistent, flower buds longer than in nutans, petals large but other- 

 wise very much like those of nutans, with tendency often towards the 

 petal characters of pycnocarpa, chrome yellow, obovate, not or scarcely 



