If you liked this, you will be delighted to learn about the “Triangle of U”: the common brassicas are not just tetraploid, they are Frankensteinian mashups of earlier diploid species with different numbers of chromosomes!
Just as fun is the Citrus triangle
https://en.wikipedia.org/wiki/Citrus_taxonomy#/media/File:Ci...
Citrons, Pomelos, and True Manderins are the progenitor wild species that were hybridized to give us everything from clementines to grapefruit to key limes and more
Bonus trivia: unlike nearly all plants, brassicas make do without symbiotic mycorrhizal fungi!
https://en.wikipedia.org/wiki/Mycorrhiza