Spade-leaf Sword, also known as Creeping Burhead and by some nicknamed Mud King, is an aquatic plant with the Latin botanical name Echinodorus cordifolius.

In Thai, this large swamp plant is known as bua amason, i.e. ‘Amazon lily’, referring to the region from where it originates, i.e. South and Central America.

This robust plant grows in dense clumps in ditches and along waterways and produces long slender flowering stalks that bear clusters of white flowers with yellow centers, at intervals.