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Thalictrum thalictroides

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Thalictrum thalictroides, synonym Anemonella thalictroides, the rue-anemone,<ref>Template:PLANTS</ref> is a herbaceous perennial native to woodland in eastern North America. It has white or pink flowers surrounded by a whorl of leaflets and blooms in spring.

Description

A flora of North America (Table 44) (7361638674)

Thalictrum thalictroides is a hairless plant growing from a cluster of tuberous roots, with upright stems Template:Cvt tall that end with flowers. The basal leaves have petioles (leaf stalks) Template:Cvt long and leaf blades that are two times ternately compound. The leaflets are widely rounded in shape and the ends are three lobed.<ref name="flora">Template:EFloras</ref>

It flowers in spring and the flowers are borne singularly, or in umbel-like inflorescences with 3 to 6 flowers.<ref name="flora" /> The flowers have short stems that hold the fully opened flowers above the foliage. The involucral bracts have three leaflets like the leaves. The showy rounded flowers have 4-15 carpels surrounded by many yellow stamens in the middle, and a cup of 5 to 10 white to pinkish-lilac petal-like sepals.<ref name="illinois">Template:Illinois Wildflowers</ref><ref name="missouri">Template:Missouri Plants</ref> The sepals are about Template:Cvt long and the filaments Template:Cvt long.<ref name="flora" />

In late spring, Template:Cvt long, Template:Linktext to Template:Linktext shaped fruits called achenes are released. The green achenes have 8 to 10 prominent veins and become dark brown when ripe.<ref name="flora" />

Taxonomy

Thalictrum thalictroides (L.) Eames & B. Boivin Rue anemone

Originally described as Anemone thalictroides by Linnaeus in 1753, it was transferred to a new, monospecific genus, Anemonella, by Édouard Spach in 1839.<ref>Template:Cite book</ref> 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.<ref>Template:Cite journal</ref> Molecular evidence supports the placement of the species within Thalictrum,<ref>Template:Cite journal</ref> and this placement is accepted by several modern treatments,<ref name="flora" /> although The Plant List retains it in Anemonella.<ref name="TPL_kew-2638832">Template:ThePlantList</ref>

Similar species

The false rue-anemone (Enemion biternatum) is similar. It has single flowers that are always white and usually have 5 sepals. They appear individually in leaf axils on a branching stem.<ref>Template:Minnesota Wildflowers</ref>

References

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External links

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