STUDIES IN TERATOLOGICAL PHENOMENA 
33 
A more extended investigation from the standpoint of anatomy and 
morphology is necessary before such a theory can be demonstrated 
as a truth. The fact that six extra-corolla segments are sometimes 
present can be explained by supposing that two segments sometimes 
result from a single ''seam." The size of these segments varies from a 
slender, thread-like structure to one as broad as the normal lobe. In 
some flowers they fuse and produce a supernumerary corolla. This 
variability is characteristic of the race as a whole, i. e., some plants 
are not more variable than others, so that the character may be said 
Fig. 4. Flowers from Fi hybrids between catacorolla and normal races, showing 
variation in expression ("dominance and recessiveness"). Each flower represents 
the typical expression in a single hybrid plant. 
to be eversporting only in the sense that a single plant may possess 
both very abnormal and slightly abnormal flowers. 
Several series of hybridization experiments are in progress, but 
they have reached only the Fi stage. The most interesting of these 
experiments relates to a study of the dominance and recessiveness of 
catacorolla. In addition to the selfed seed produced by the parent 
