For another example of a plant that just didn't make it into modern society at scale, there are skirrets. Carrots, parsnips, and skirrets were related umbellifer plants with edible, nutritious roots, cultivated over the centuries as food. Carrots and parsnips were responsive to breeding for root size, and could produce comparatively huge roots, but skirrets never really did. Once the potato was brought over from the new world, the skirret fell out of favor.

Wood sorrel is an interesting case. In the US, we don't commonly eat our native wood sorrel, i.e. the thing that looks like clover. But we do eat starfruit. Starfruit is also a type of wood sorrel, just one that has a much larger, sweeter fruit, that's been selectively bred for agriculture. But if you look at the fruits of our native plant, they do look like tiny starfruit! link

They're still tasty. They're very tart, but with no sweetness. They could be good to top a salad. But you'd have to pick hundreds of them to get as much food as you get from one starfruit, and it wouldn't be as tasty as a fruit. Like eating a lemon instead of an orange.

That said, I still love them! The leaves and stems also have a good taste. They're everywhere and have a lovely burst of flavor. Just be careful if you have kidney stones or kidney disease, any kind of wood sorrel - including starfruit - has oxalic acid which can be tough on kidneys.

How do you get dandelions to not taste like poison?