Tall perennial plant with pale pink flowers (5,6)
(Other definitions for marsh mallow that I've seen before include "Spongy confectionery" , "Confection commonly toasted" , "Spongy confection - wild flower" , "Spongy confection, often toasted" , "Sweet, often toasted" .)
(Other definitions for marshmallow that I've seen before include "Spongy confection - wild flower" , "Spongy jellylike sweet" , "Spongy confection - pink-flowering plant" , "Confection commonly toasted" , "Soft sweet" .)