The Western myall is one of the largest trees in the Roxby Downs area. It grows to approximately 8 metres in height and has a shady umbrella-like crown. Its yellow flowers only appear after heavy rainfall. The wood is dark brown, hard and durable, and was historically used for fencing. The Western myall is a long-lived plant, whose life span has been estimated at 600-1000 years. Its thin, almost needle-like foliage is a silvery grey colour.

Distribution of the Western myall in Australia.