A morphometric approach to track opium poppy domestication. 

Jesus A, Bonhomme V, Evin A, Ivorra S, Soteras R, Salavert A, Antolín F, Bouby L. 

Sci Rep. 2021 May 7;11(1):9778. doi: 10.1038/s41598-021-88964-4. PMID: 33963241; PMCID: PMC8105347.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8105347/