Wampee

[…] bulrushes, nut grass, corn grass, switch grass, and the wampees (Pontederia and Peltandra).

Wampee is the Indian name for the tubers of certain swamp plants, […] […] (Pontederia cordata), which occurs in swamps from Nova Scotia to Minnesota and southward to Texas and […] the success they have obtained in hog raising by utilizing the native wampees suggests the possibility of developing a type of agriculture on the old rice lands in which not only native wampees but various other swamp tuberous plants cultivated in Japan […]

Pontederia cordata, the pickerel weed, is a member of a small group of aquatic plants usually found in warmer regions of the world. Other common names include dog tongues and wampees. I don't know what the reference to dog tongue is, but the connection with wampees could be the similarity between the seeded pulp of the Chinese […]