Rhizomatous perennial to about 50 cm tall. Stems hollow, 4-angled. Leaves linear to lanceolate, to 2.5 cm long, toothed towards the tip, base slightly stem-clasping. Corolla tube to about 2 cm long, the lobes white with purplish veins; summer.
G. peruviana L., native to New Zealand and S America is widespread in wet areas around Australia; it has ovate leaves and pale pink flowers and is occasionally available. [G. latifolia R. Br.]
Source: (2002). Scrophulariaceae. 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.