Aniseroot is a native, erect, perennial plant, growing to 2+ feet high on occasionally branching stems that are mostly green, to reddish-green and either smooth, with some hair or densely covered with straight fine hairs.

Leaves are alternate, compound - 2 times pinnately divided. Each compound leaf is subdivided into 3 major stalked sections, the terminal section on the longest stalk, each section further subdivided. The margins have shallow clefts and crenations. The veins on the underside typically have whitish hair.

The inflorescence is a tall stem topped by a compound umbel, the umbel having around 3 or more, (typically 5) small umbels (umbellets). The umbellets will have 8 to 16 flowers each with several lance shaped green persistent hairy bracts at the base and usually the bracts will be at the base of the main umbel also.

Flowers: The white flowers themselves are small with 5 petals with notched tips. One or two of these petals will usually be longer than the others and the margins of the petals will have a slight fold. There are also 5 stamens with white filaments and white anthers that alternate with the petals and a white style with two spreading stigmas, the style as long or slightly longer than the petals. Anthers will turn darker after pollen maturity.

Seed: Flowers mature to a long and slender pod structure that splits into 2 seeds. It has slightly curved sides and is black at maturity.

Varieties: See notes at page bottom.

Habitat: Aniseroot has a rhizomatous root system and grows in moist woods and wood edges in light shade or dappled sunlight. Foliage of the Osmorhiza genus will produce a slight anise sent when crushed and the root of this species has a strong anise scent.

Names: An older scientific name for Aniseroot is Myrrhis longistylis. The current genus name, Osmorhiza, is derived from two Greek words, osme, meaning 'fragrance' and rhiza meaning 'root'. Together referring to the scented root. The species name longistylis is from the Greek root longus, meaning 'long' and with stylis referring to the longer style of this plant that is at least equal to the height of the petals or above them. The author names for the plant classification are first, ‘Torr.’ which refers to John Torrey (1796-1873), American botanist, who, among many things, taught Asa Gray, contributed to the early parts of Flora of North America and who published the reports of plants collected by John C. Fremont’s 1842 and 1843-1844 Exploring Expeditions to the Rocky Mountains and Howard Stansbury's Exploration of the Valley of the Great Salt Lake, 1849-1850. His classification was revised by ‘DC’ who was Augustin Pyramus de Candolle (1778-1841), Swiss botanist, who influenced Charles Darwin. He studied plants, began a systematic catalogue and has 2 genera named for him.

Comparison: A close relative is O. claytonii, Bland Sweet Cicely. Key differences are the umbellets of O. claytonii have only 4 to 7 flowers, the styles are shorter than the petals and the leaflets are more deeply cleft. [A technical article from Ohio State University on the differences between the two] Another plant with a name that can be confused with Aniseroot is Myrrhis odorata. This plant is in the same family and is variously called "Anise", "Smooth Cicely" and "Sweet Cicely". That plant is not native and has more carrot-like leaves and is planted as a garden ornamental.