Figwort family (Scrophulariaceae)
Description: This introduced biennial plant is 2-4' tall and either unbranched or sparingly branched. The central stem is stout, ribbed, and usually glabrous beneath the inflorescence. The basal leaves of 1st-year plants form a low-growing rosette about 8-12" across. During the second year, this species bolts upward with alternate leaves along the flowering stems. They are up to 6" long and 2½" across, becoming smaller as they ascend the stems. The leaves of these 2nd-year plants are broadly lanceolate with margins that are coarsely crenate or dentate. Sometimes the margins are slightly undulate and irregular. The lower leaves strongly clasp the stems, while the upper leaves near the inflorescence are more likely to be sessile. The upper surface of each leaf is wrinkled along the veins and hairless. The central stem and upper side stems (if any) terminate in tall spike-like racemes of flowers about ½–2' in length. The stalks of these racemes are glandular hairy. Each flower spans up to 1" across, consisting of 5 spreading petals, 5 stamens, a hairy green calyx with 5 pointed lobes, and a single pistil with a green stigma. The petals are usually white or pale yellow, and they often have purplish pink or greenish brown tints on the surface facing the calyx. The center of the flower has fine purple hairs around the stamens and the base of the petals are often some shade of purple or pink. The pedicel of each flower is about ½" long, and there is a tapering green bract of about the same length at its base. The blooming period usually occurs during the summer, and lasts about 1-2 months. Each flower is replaced by a round capsule containing numerous seeds. The root system consists of a stout taproot. This plant spreads by reseeding itself.
Cultivation: Moth Mullein is an adaptable plant that usually grows in full sunlight, moist to dry conditions, and rather poor soil that contains gravel or clay. In dry poor soil, this plant can be rather small, while at sites with fertile soil and more moisture it can become rather large.
Range & Habitat: Moth Mullein is a common plant that occurs in most counties of Illinois. However, it is less common or absent in NW Illinois (see Distribution Map). This species originated from Eurasia. Habitats include pastures, abandoned fields, vacant lots, irregularly mowed lawns, areas along roadsides and railroads, and gravel bars along rivers. It prefers highly disturbed areas and is not invasive of natural areas to any significant degree.
Faunal Associations: The pollen of the flowers is collected by bumblebees and Halictid bees. Syrphid flies feed on the pollen, but they are probably not effective at pollination. Little information appears to be available about this species' relationships to birds and mammals.
Photographic Location: An irregularly mowed vacant lot near a railroad in Urbana, Illinois. There were groundhogs with dens nearby, but they did not appear to bother this species, preferring other plants.
Comments: This is a variable species with attractive flowers and unattractive foliage. There are two basic color forms: plants that produce yellow flowers, and those that produce white flowers. The common name refers to the fancied resemblance of the flowers to moths. Moth Mullein often produces a spike-like raceme of flowers of exceptional length, considering the size of the plant. It has a very different appearance from Verbascum thaspum (Great Mullein), although they are both tall-growing and spike-like. Great Mullein has less showy yellow flowers, and its leaves are larger in size and covered with fuzzy white hairs.