Mandrake is a monster that can be found in the forty-seventh floor in SAO.
The creature takes the appearance of a gigantic flower, standing up by using its roots, with a dark green stem about as thick as a human arm. The head of the flower appears to be a yellow sunflower with a wide mouth and several teeth. It has two vines sprouting from either side of its body that it uses similar to how animals user their arms.
This man-eating flower is capable of walking with the use of its roots and attacks by using its mouth and vines. Despite its grotesque appearance, the creature is relatively weak and can easily be defeated by having a white spot under its flower head attacked.