Mysore thorn is a perennial shrub, growing to 2-4 metres, or a sprawling climber to 15 metres high, which readily forms a dense impenetrable thicket.

It has tap roots and lateral roots.

Mysore thorn is a vigorous growing plant capable of climbing and engulfing native vegetation, fences, sheds, bridges and other infrastructure.

The long spines of the Mysore thorn can inflict serious injury to humans and animals, native and domestic. Mysore thorn forms dense thickets restricting access of stock and machinery to vital areas like water, pastures and roads.

Thorns on the stems are straight or hooked and aid in its ability to climb.

Leaves are bi-pinnate and up to 300 mm long. Leaflets are dark green above and pale beneath. Leaflets are about 8 mm wide and covered with fine hairs.

Mysore thorn has distinctive pale yellow flowers, growing in racemes which protrude up to 50 cm above the main plant. Flowers have prickles at the base.

Flowering in winter-spring, Mysore thorn produces brown woody pods in spring-summer.

Seeds are easily spread by water and possibly rodents. The seed can remain viable in the soil for up to 10 years.