Commemorating Olaf Toren, an 18th century Swedish clergyman.
Mostly low, perennial and annual herbs. Leaves opposite, entire, round-toothed. Flower clusters terminal or axillary but short and with few flowers. Calyx tubular, pleated, ribbed or winged. Corolla cylindrical, 2-lipped, the upper lip erect, the lower lip spreading. Stamens 4, in 2 unequal pairs. Fruit capsule cylindrical to ovoid, with numerous seeds.
Wide, slightly Antirrhinum-like flowers with bent stamens.
40 species from Africa and Asia.
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.