A. blakei thrived in that kind of a situation. My work was to run some experimental tests designed to test Rad's hypothesis. I approached the problem in a variety of ways. I was curious about the chromosome number of the three species involved. After all, most polyploids were known to be of hybrid origin, and the amphidiploid state was one method of survival.
Amphidiploids originate by the formation of the hybrid at the diploid state.
The resultant hybrid, of the number is doubled, immediately behaves like a diploid because of the reappearance of the homology lost in the diploid hybrid state. This chromosome number would be twice the number of the two alleged parental taxa. My initial work indicated this was not the case. I did see some meiotic irregularities in A. blakei, however, and this is always a possible indication of hybrid origins. Mixing genetic material from two different species is often disruptive when gametes form.