A beautiful (and useful!) carpet-like green cover floating on the bayou is the smallest plant in the fern family. Its common name is duckweed, its botanical name is Lemnacae It is the second highest plant in nitrogen content, after soy. It can even be used as an organic fertilizer! It also prevents some mosquito reproduction and where you find it in the swamps, there will be less of these pesky creatures. Some varieties of duckweed turn red in the fall, making for gorgeous scenery in our southern Louisiana marshes.