A yellow dye is produced from the bark of the white poplar. The wood used by Donatello is that of White poplar. Others attribute it to the Italian word "gattice", designating a type of white poplar. The introduced white poplar is escaping from cultivation. White poplar is also an environmental weed in South Africa. Riparian woodlands includes such types of trees as white poplar, oak, alder-tree and white acacia. The natural by-river forest consists mainly of White Poplar (Populus Alba). The white poplar is an invasive species in many parts of Australia. Like other plants associated with Pluto, white poplar was regarded as a contraceptive in antiquity. The White Poplar, by contrast, is native to warmer regions, with hot, dry summers.