Perennial herb, dying down each year in summer. Leaves dark green, glossy, pinnately lobed. Flower spikes with spiny, ovate bracts. Flowers white. Shows a tendency to spread, sometimes being difficult to eradicate; naturalised in SA and Qld.
Source: (2002). Acanthaceae. In: . Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.