 "Citrus australis" is a tree up to 20 m tall.Fruits are spherical or slightly pear-shaped, 25–50 mm across, with a thick green or yellow skin and pale green pulp.The 1889 book "The Useful Native Plants of Australia" records that "The fruit, which is an inch and a-half in diameter and almost globular, yields an agreeable beverage from its acid juice."