千屈菜
As artificial floating islands (AFIs) have been used to help purify water in the restoration of the Beijing Wetlands. Several plants were studied in 2011, including soft stem bulrush ("Scirpus validus" Vahl), spiked loosestrlfe ("Lythrum salicaria" Linn.), yellow-flowered iris ("Iris wilsonii") and dwarf cattail ("Typha minima"), to evaluate the chemical and vegetative characteristics of each type of plant.