My spring beauties are flowering in the garden, appearing a little before wood anemones (hvitveis).
The one I grow is Claytonia virginica and last summer I found this monster tuber:
I still haven’t got round to eating the tubers (Euell Gibbons was a fan!), but I regularly eat the spring leaves and flowers in mixed salads. I would love also to try other tuberous species like Claytonia caroliniana and C. tuberosa but have never seen a source :-(
More about spring beauties in Green Deane’s article here: http://www.eattheweeds.com/spring-beauty