Herb Wagner, in 1953, suggested instead that it was the hybrid of " A . montanum " and " A . platyneuron ", noting that Eaton and W . N . Clute had already made tentative suggestions along those lines . } } His cytological studies the following year showed that " A . bradleyi " was an allotetraploid, the product of hybridization between " A . montanum " and " A . platyneuron " to form a sterile diploid, followed by chromosome doubling that restored fertility.
