Banksia sessilis is a species of shrub in the family Proteaceae, native to the southwest of Western Australia. It grows up to 3 meters (9.8 feet) tall and has a width of up to 3 meters (9.8 feet). The leaves are dark green, leathery, and serrated, with a length of up to 25 centimeters (9.8 inches) and a width of up to 4 centimeters (1.6 inches). The flowers are cylindrical in shape and grow up to 12 centimeters (4.7 inches) long and 5 centimeters (2.0 inches) wide. They are usually yellow or green in color, but can also be pink or red.