Caltha palustris
They also use Acer rubrum, Acornus calamus, an unknown Amelanchier species, Caltha palustris, Cardamine diphylla, Cornus canadensis, an unknown Crataegus species, Fragaria virginiana, Gaultheria procumbens, Osmunda cinnamomea, Phaseolus vulgaris, Photinia melanocarpa, Prunus virginiana, Rubus idaeus and another unknown Rubus species, Solanum tuberosum, Spiraea alba var. latifolia, Vaccinium angustifolium, and Zea mays as a tea, soup, jelly, sweetener, condiment, snack, or meal.