Mousetail
Myosurus minimus
Buttercup family (Ranunculaceae)

Description: This little plant is a winter or spring annual, producing a rosette of basal leaves and one or more flowering stalks. Individual basal leaves are 2-4" long and about 5 mm. across; they are medium green, linear in shape, glabrous, and smooth along their margins. The tips of the basal leaves are blunt. Each flowering stalk is 2-6" long and unbranched; it is usually naked, except for a single flower at its apex. Each stalk is medium green, glabrous, and terete.

Each flower consists of 5 petals, 5 sepals, 5-10 stamens, and an elongated ovary that becomes 1–2½" long at maturity. The sepals are located at the very bottom of the flower; individual sepals are about 5 mm. long, whitish green, widely spreading, and lanceolate-oblong in shape. In addition to its upper portion, each sepal has a spur-like extension that is narrowly triangular in shape and extends downward. Individual petals are about 5 mm. long, yellowish green, linear in shape, and bent downward and outward toward the middle. There is a nectary located at either the apex of each petal or its base. The cylindrical ovary consists of numerous pistils; it is usually green, although sometimes red toward its apex in sunny situations. The blooming period occurs from mid-spring to early summer and lasts about 1-2 months. The flowers are at least partially self-fertile. At maturity, each pistil of the ovary is replaced by a single achene. The small achenes are bluntly rectangular and somewhat flattened; they have short beaks. The root system consists of a tuft of fibrous roots from a short crown. This plant reproduces by reseeding itself.

Cultivation: Mousetail adapts to full or partial sun, moist to slightly dry conditions, and soil containing loam, sandy loam, gravelly loam, or clay-loam. Most growth and development occurs during the cool moist weather of spring.

Range & Habitat: Mousetail is found occasionally in the southern half of Illinois, while in the northern half of the state it is rare or absent (see Distribution Map). It is native to North America, Eurasia, and northern Africa. Habitats include barren areas along woodlands, eroded areas along streams, cropland and pastures, damp areas bordering mud puddles, gardens and outdoor nurseries, and sunny waste areas. Generally, this plant is found in disturbed areas where there is scant ground vegetation and exposed soil.

Faunal Associations: Very little is known about floral-faunal relationships for this obscure little plant. The flowers are pollinated, at least in part, by small insects; both pollen and minute amounts of nectar are available as floral rewards to such visitors. Robertson (1929) observed the Halictid bee, Lasioglossum zephyrus, collecting pollen from the flowers, while Müller (1873/1883) observed the Syrphid fly, Melanostoma melinum, and several other small flies and parasitoid wasps visiting the flowers. However, such floral visitors are relatively uncommon.

Photographic Location: An area with exposed soil near the county courthouse in Urbana, Illinois.

Comments: This odd-looking little plant is easily overlooked and often omitted from many wildflower and weed guides. It is now time to bring this plant to the attention of members of the public. Mousetail superficially resembles a plantain (Plantago sp.) with narrow leaves, but it belongs to a very different family of plants (Ranunculaceae). Other species of plants in this family are quite distinct in appearance because of their showier petals, wider leaves, and/or shorter ovaries. As a result, Mousetail is easy to identify once one becomes familiar with it. Several subspecies have been described, but only the typical subspecies, ssp. minimus, has been found in Illinois.

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