74. SCHAFFNER: SEX REVERSAL IN THE JAPANESE HOP 
japonicus, but Winge is convinced that H. Lupulus has ten 
(haploid) and twenty (diploid) chromosomes and H. japonicus 
eight (haploid) and sixteen (diploid). He found no evidence of 
an allosome. 
When Japanese hop is planted in the greenhouse in winter 
it becomes greatly dwarfed and the sexual state is much con- 
fused in a very large percentage of cases. Seed planted December 
8th, 1920, in shallow benches produced twenty-two plants. 
They began to bloom in the sixth week after planting, some in 
exactly twenty-four days after coming out of the ground. The 
growth is considerably slower than in hemp under the same 
conditions. The plants usually have two or three pairs of leaves 
when they begin to bloom. Of the twenty-two plants raised 
in the winter of 1920-21, six were staminate and all showed re- 
versal to the carpellate condition, i. e., they were staminate 
plants which produced carpellate structures from certain parts 
of their bodies. The carpellate structures appeared to be of all 
degrees of perfection. The remaining sixteen plants were car- 
pellate and of these seven showed reversal to the male condition, 
producing staminate flowers or structures in various degrees of 
perfection, while nine remained pure carpellate and showed no 
sex reversal. Some of the carpellate intermediate individuals 
showed sex reversal at the beginning of blooming in the terminal 
inflorescence while others did not do so until a large number of 
typical carpellate inflorescences had been produced, and then 
only in axillary inflorescences developed at the base of the plant. 
One plant was especially remarkable in that it appeared to be 
pure carpellate in nature and had produced twelve normal 
carpellate inflorescences, when finally a tiny axillary cluster 
was developed near the base of the stem which showed one 
~ovulary with a well-developed stamen at its base. No more 
staminate structures were found on this plant. Another de- 
cidedly carpellate plant developed thirty-six inflorescences and 
then produced a tiny cluster from near the base of the stem with 
several abnormal flowers. There were three stamens in the 
cluster. Other plants, both staminate and carpellate, produced 
numerous flowers or almost entire inflorescences of the opposite 
sexual state. 
ough the staminate plants usually show sex reversal im- 
mediately, one plant remained pure in expression for a long 
