This work continued with the 1947 paper Types of polyploids : their classification and significance , which described Stebbins ' ideas about the role of paleopolyploidy in angiosperm evolution . He argued that chromosome number may be a useful tool for the construction of phylogenies . This work continued with the 1947 paper `` Types of polyploids : their classification and significance '' , which detailed a system for the classification of polyploids and described Stebbins ' ideas about the role of paleopolyploidy in angiosperm evolution , where he argued that chromosome number may be a useful tool for the construction of phylogenies .