Erect perennial herb to about 1.5 m tall. Leaves in whorls of 4-7, lanceolate to oblanceolate, saw-toothed. Flower spikes to 30 cm long. Corolla 8-9 mm long, mostly blue, sometimes white or pink; summer.

NE America

Source: Spencer, R. (2002). Scrophulariaceae. In: Spencer, R.. 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.