The poppy that produces opium is the Breadseed Poppy Papaver somniferum.
You can buy ten thousand California Poppy seeds at any Home Depot for $3.97.
https://www.homedepot.com/p/Stover-California-Poppy-Seed-790...
I guess there's a critical opium threshold the law applies? Or does it just name the forbidden ones?
They do not.
There are hundreds, if not thousands, of poppy varieties that produce no morphinan alkaloids.
Morphinan alkaloids become "opium".
https://www.poison.org/articles/what-to-know-california-popp...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10017456/
I guess there's a critical opium threshold the law applies? Or does it just name the forbidden ones?