Apologies if you are not in the South; but there are completely different plants in the warmer regions. No rampion
Our earliest Sprig foods all seem to be flowers:
REDBUD is something many folks do not know how to utilize: the tiny, bright pink flowers look like infinitesimal orchids, and are edible; but the big draw is the little flat pods that follow. Redbud are in bloom now so it's time to start looking! Many folks have (in books and online) declared the redbud pods to be inedible. Well, they ARE if you wait too long: they are sweet and delicious when they are thin and easily folded, and mostly a pale translucent green tinged with red. By the time they have gotten opaque and stiff, they are tannic and fibrous. So use them for the few days they will be soft: so soft they feel like thin, foldable silicone. And yes you will need a lot of them for a main dish!! They are small. But free food is free food, and if you have a lot of redbud trees, it's fun to do; notice which ones bloomed first and collect sequentially.
SPRING BEAUTY/Claytonia Virginia is everywhere here, in the burbs; entire lawns are covered in pale pink flowers, like a fluffy carpet. The tubers are never very far underground, and are supposed to taste better than new potatoes. We have none on our land, despite a rather intensive program several years ago, of transplanting from the roadsides. Too many hungry digging varmints, not enough cats and dogs running around. (there is at least one organization scooping up loose cats and dogs here in the South, and after spay/neutering and giving shots, reselling them in the Northeast for big bucks). People in the States where, back in the 80's, you couldn't have an unswayed/neutered pest are now finding to their chagrin that you will have to pay $100 for a baby kitten. Some people confuse virtue with other things...anyway, there are just far fewer family farms now; used to be a barn wherever you looked and all of them full of cats. It's interesting that the same cities that are kept "clean" of vagrant dogs and cats are now having rat infestation problems. (Boy, I sure get off topic, don't I?!)
WISTERIA is yes, a mostly toxic plant; but so is the tomato, and rhubarb leaves are also toxic. The beautiful, fragrant, sweet, crisp blossoms of wisteria are the only edible part of the plant; but they are superabundant while the plant is in bloom! Throw them into a salad, or let. them mostly BE the salad, and enjoy! You could also candy them as well: thinly paint on beaten egg white and then sift on superfine (not 10x) sugar, leave on a rack til thoroughly dry, and store sealed. High-end restaurants pay big bucks for these, from their foragers!! And lest you sneer at eating flowers - remember that perennial plants have superior nutrition because their roots extend deeper and further every year, mining nutrients from far below the topsoil.
And now I'm drawing a blank; what are some other springtime wild foods, food in warmer States/areas?