The cuckoo is also called the scabbard, filled with bar stools, filled with round beads, filled with swamp bar, foliage fill, ray bar, Sesban-River Bean, scientific name Sesbania sesban (Jacq) W.Wight, of the Fabaceae family.

Shrub height 1 - 4m, sometimes higher, round shape ball, blue with purple stripes, branching much, carrying double leaf feathers with 30 - 40 leaflets; deep roots of about 60-70cm, with the symbiont-fixing bacteria. Yellow flowers grow in clusters, each cluster has 8-10 big flowers. Fruit straight, down, length 20 - 30cm, contains many spherical, brown ball. When the fruit ripen, the seeds fall into the mud, soil, water in the next season to sprout new trees.

Diarrhea is common in wetlands, wetlands, from brackish water to highland 500m, scattered from northern provinces such as Hai Duong, Hung Yen, Ha Nam, Ninh Binh ... to the provinces of the Mekong Delta . It is grown in the southern provinces and Dong Thap Muoi. People cultivate wild cats to get the body bulge and white foam submerged under the water to make hats and cork, get the stems for firewood, leaves for green manure; leaves of medicinal plants. Parts used for food are: leaves, cotton and seeds.