Thalictrum thalictroides

Species of flowering plant
false rue anemones

Thalictrum thalictroides (syn. Anemonella thalictroides), the rue anemone or windflower,

It flowers in spring, with flowers are borne singly or in umbel like inflorescences with 3 to 6 flowers. The sepals are about long and the filaments long.

Originally described as Anemone thalictroides by Linnaeus in 1753, it was transferred to a new, monospecific genus, Anemonella, by Édouard Spach in 1839. Although similar to plants in the genus Thalictrum, Sprach considered the diminutive size, umbelliform inflorescence, and tuberous roots of this species to be distinctive enough to designate a new genus. Bernard Boivin considered this distinction suspect, and transferred the species to the genus Thalictrum in 1957. Molecular evidence supports the placement of the species within Thalictrum, and this placement is accepted by several modern treatments,

It typically inhabits banks and thickets in low lying deciduous woodland, at Distribution is mainly in the north eastern United States, and Ontario in Canada.

The rue anemone is often confused with the similar species, the false rue anemone (Enemion biternatum). Both plants have white flowers that appear in early spring and grow in wooded areas. However, the false rue anemone is more likely to be found in moist bottomlands and can form large colonies, while the rue anemone grows singly on wooded slopes. Sometimes rue anemone sepals are pale to dark pink, whereas false rue anemone sepals are always white. The false rue anemone holds its flowers in leaf axils, most often singly. In contrast, the flowers of a rue anemone appear in a cluster above a whorl of leaf like bracts, most often in groups of three to six. While false rue anemones always have five sepals, rue anemones can have five to ten sepals. False rue anemones have a small cluster of no more than six green carpels in the center of the flower, while rue anemones sometimes have as many as fifteen. False rue anemones usually have deep clefts in their leaves, while rue anemones do not.