Thalictrum thalictroides

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Thalictrum thalictroides
Conservation status

Secure (NatureServe)
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
(unranked): Eudicots
Order: Ranunculales
Family: Ranunculaceae
Genus: Thalictrum
Species: T. thalictroides
Binomial name
Thalictrum thalictroides
(L.) A. J. Eames & B. Boivin
Synonyms

Anemone thalictroides L.
Anemonella thalictroides (L.) Spach

Thalictrum thalictroides (Rue-anemone) is a spring ephemeral plant in the buttercup family, prized for its white to pink flowers, native to woodland in eastern North America.

Description[edit]

T. thalictroides is a hairless plant growing from tuberous roots, with upright 10-30 cm tall, stems which end with flowers. The basal leaves have 10 to 30 cm long petioles and leaf blades that are 2×-ternately compound. The leaflets are widely rounded in shape and the ends are three lobed.

It flowers in early spring and the flowers are borne singularly, or in umbel-like inflorescences with 3 to 6 flowers. The flowers have short stems that hold the fully opened flowers above the foliage. The involucral bracts are 3-foliolate, and shaped like the leaves. The showy rounded flowers have many yellow stamens in the middle, and a cup of white to pinkish-lavender sepals.

In late spring, 3 to 4.5 mm long, ovoid to fusiform shaped fruits called achenes are released. The green achenes have 8 to 10 prominent veins and become dark brown when ripe.[1]

Taxonomy[edit]

Originally described as Anemone thalictroides by Linnaeus in 1753. It was transferred to a new, monospecific genus, Anemonella, by Édouard Spach in 1839.[2] 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. JRB Boivin considered this distinction suspect, and transferred the species to the genus Thalictrum in 1957.[3] Molecular evidence supports the placement of the species within Thalictrum,[4] and this placement is accepted by several modern treatments.[5]

References[edit]

  1. ^ Flora of North America
  2. ^ Spach, E. 1839. Histoire naturelle des vegetaux Phanerogames, 7:186-409
  3. ^ Eames A. J. & B. Boivin. 1957. Bull. Soc. Roy. Bot. Belgique. 89: 319.
  4. ^ Ro K. and B. A. McPhearson. 1997. Biochemical Systematics and Ecology 25:445
  5. ^ Park, M. M. and D. Festerling. 1997. Thalictrum. In: Flora of North America. Vol. 3

External links[edit]