378 
A. B. STOUT 
from the root upward, but most usually the two are more or less fused 
for a distance, the fusion finally becoming complete near the top of the 
plant. None of the plants of this variety have shown any tendency 
to live over winter. The maturity and death of the stems and branches 
is accompanied by death of the roots. Several attempts to obtain 
new plants from root cuttings taken at the time of the maturity of 
plants have failed. 
The wild white-flowered plant used in crosses with plants of the 
red-leaved Treviso is perennial as are wild plants of chicory in general. 
In the five years it has been under observation its mature height has 
ranged from 2J4 to 23/^ feet. Its rosette leaves are few, much smaller 
in size than those of the red-leaved Treviso, and are flat in habit of 
growth. The branches are few and strongly horizontal, giving the 
plant a sparsely branched and scraggly appearance. 
The Fi generation plants of the crosses between plants of the red- 
leaved Treviso variety and the wild plant just mentioned were more 
like the red-leaved Treviso in habit of growth. They were all blue- 
flowered. Their height ranged from 4 to 6 feet, and they were abun- 
dantly and profusely branched from the base. The degree of the 
duplication of the main stem was much less than in the family of the 
red-leaved Treviso. As shown in text figure 2, the plants of this hybrid 
generation were large and well developed and of marked vegetative 
vigor. They were far more robust and vigorous in growth than the 
wild parent, and in respect to the degree of branching they were more 
developed than plants of the red-leaved Treviso strain. 
The sex vigor of these plants and of plants of the Treviso variety 
in respect to production of flowers was commensurate with the vege- 
tative vigor. From statistical data obtained in studies of flower 
number, it was found that the total number of flower heads produced 
by individual plants ranged roughly from 2,000 to 3,500 with the 
average number of flowers per head at about 17. At the climax of 
development as many as 100 to 150 flower heads opened in a single day. 
These statements together with the descriptions given and the illus- 
trations in the accompanying text-figures give some conception of the 
full and complete sex vigor seen in the profuse production of flowers 
that set seed when pollinated with pollen that was compatible. 
It will also readily be observed that the inbreeding within the family 
of red-leaved Treviso involved crosses between plants of close blood 
relationship and of decided similarity, and that the fertilization in 
