I came across the Silphium plant that went extinct around 64 AD. It is believe that emperor Nero was to have eaten the last known stalk!
It surprised me that such a valuable plant was not cultivated through agriculture.
Are there other plants that we know to have literally eaten out of existence?
Oh I did read that, I just felt it was too speculative and took that with a grain of salt. The roman empire was vast and found it odd that in across the vast geographies, they were simply unable to grow the crop.