Circaea

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Circaea
Circaea lutetiana01.jpg
Circaea lutetiana
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Onagraceae
Subfamily: Onagroideae
Tribe: Circaeeae
Genus: Circaea
Tourn. ex L.
Synonyms [1]
  • CarlostephaniaBubani
  • OcimastrumRupr.
  • RegmusDulac

The Circaea, or enchanter's nightshades, are a genus of flowering plants in the evening primrose family Onagraceae. [1] About two dozen taxa have been described, including eight species. Plants of the genus occur throughout the temperate and boreal forests of the Northern Hemisphere. Three taxa occur in North America: Circaea alpina , Circaea canadensis , and the hybrid Circaea × sterilis. The generic name Circaea refers to the enchantress Circe from Greek mythology who is said to have used the herb as a charm.

Contents

Description

Members of genus Circaea are perennial, herbaceous plants with erect stems, which may or may not be branched. The stem leaves are opposite and petiolate, with toothed edges (i.e., with dentate leaf margins). The inflorescence is a terminal, erect raceme, with additional racemes at the apices of stem branches (if any). Flowers are dimerous with 2  sepals, 2  petals, and 2  stamens. The sepals, petals, and stamens alternate such that the stamens ultimately align with the sepals. The petals are white or pink in color. The fruit is a capsule with one or two seeds. Plants disperse their seeds by producing burrs that adhere to clothing, fur, and feathers. [2]

Taxonomy

Circaea lutetiana Enchantersnightshade.jpg
Circaea lutetiana
Circaea alpina Circaea alpina 6758.JPG
Circaea alpina

In 1753, Swedish botanist Carl Linnaeus established the genus Circaea by describing two species, Circaea lutetiana and Circaea alpina. [3] Linnaeus also described a variety of C. lutetiana, which later became known as Circaea canadensis. [4]

The generic name Circaea refers to the enchantress Circe from Greek mythology. Botanists in the late 16th century believed Circe used the herb to charm Odysseus' companions, [5] hence the common name enchanter's nightshade (not to be confused with the nightshade family of plants, which are unrelated). Molecular evidence indicates the closest relative to Circaea is the lineage that gave rise to the genus Fuchsia , which diverged from it around 41 million years ago. [6]

Taxa

As of August 2022, Plants of the World Online (POWO) accepts eight species and eight subspecies: [1]

POWO also recognizes eight named hybrids:

For example, the parents of Circaea × sterilis are C. alpina and C. canadensis. The hybrid is sterile but spreads vigorously by vegetative means. [8]

Distribution

Members of genus Circaea occur throughout the temperate and boreal forests of the Northern Hemisphere, from near sea level to 5,000 meters (16,000 ft) altitude, and from 10°–70° N latitude. [9] Circaea alpina is the most widespread species, ranging across North America, Europe, and Asia. [7] Likewise Circaea canadensis ranges across continents, in North America, European Russia, and Asia. [4] Circaea lutetiana occurs throughout Europe, ranging eastward to Iran. [10]

Three taxa are known to occur in North America: Circaea alpina, Circaea canadensis, and the hybrid Circaea × sterilis. [11] C. alpina is wide ranging across the continent, from California to Alaska in the west, and from Newfoundland to North Carolina in the east, while C. canadensis is confined to the eastern half of North America. The hybrid, C. × sterilis, is found wherever the ranges of its parent species overlap.

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<i>Daphne</i> (plant) Genus of flowering plants in the family Thymelaeaceae

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<i>Epimedium</i> Genus of flowering plants belonging to the barberry family

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<i>Lamium galeobdolon</i> Species of flowering plant

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<i>Anemonastrum canadense</i> Species of flowering plant in the buttercup family Ranunculaceae

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<span class="mw-page-title-main">Bur</span> Seed or dry fruit or infructescence that has hooks or teeth

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<i>Circaea lutetiana</i> Species of flowering plant in the willowherb family Onagraceae

Circaea lutetiana, known as broad-leaved enchanter's nightshade, is a plant in the evening primrose family, Onagraceae.

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<i>Urtica gracilis</i> Species of flowering plant

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<i>Circaea alpina</i> Species of flowering plant in the willowherb family Onagraceae

Circaea alpina, commonly called alpine enchanter's nightshade or small enchanter's nightshade, is a 10–30 cm tall perennial herb found in cool forests of the Northern Hemisphere.

<i>Lopezia</i> Genus of flowering plants belonging to the evening primroses and fuchsias family

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<i>Circaea canadensis</i> Species of flowering plant in the willowherb family Onagraceae

Circaea canadensis, known as eastern enchanter's nightshade, Canada enchanter's nightshade, broad-leaved enchanter's nightshade, is a perennial herbaceous plant found in forests of eastern North America. It is very similar to its sister species, Circaea lutetiana, and was formerly considered conspecific.

Circaea × intermedia is a hybrid of flowering plants in the evening primrose family Onagraceae. The parents of the hybrid are Circaea alpina and Circaea lutetiana.

Circaea × sterilis is a hybrid of flowering plants in the evening primrose family Onagraceae. The parents of the hybrid are Circaea alpina and Circaea canadensis.

Circaea × decipiens is a hybrid of flowering plants in the evening primrose family Onagraceae. The parents of the hybrid are Circaea erubescens and Circaea canadensis subsp. quadrisulcata.

Circaea × mentiens is a hybrid of flowering plants in the evening primrose family Onagraceae. The parents of the hybrid are Circaea alpina and Circaea erubescens.

Circaea × skvortsovii is a hybrid of flowering plants in the evening primrose family Onagraceae. The parents of the hybrid are Circaea cordata and Circaea canadensis subsp. quadrisulcata.

Circaea × ovata is a hybrid of flowering plants in the evening primrose family Onagraceae. The parents of the hybrid are Circaea cordata and Circaea mollis.

Circaea × taronensis is a hybrid of flowering plants in the evening primrose family Onagraceae. The parents of the hybrid are Circaea alpina subsp. imaicola and Circaea cordata.

References

  1. 1 2 3 "Circaea L." Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 16 August 2022.
  2. ↑ Boufford, David E. "Circaea Linnaeus". Flora of North America. Retrieved 21 August 2022.
  3. ↑ Linnaeus, Carl (1753). Species Plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas. Vol. 1. Stockholm: Impensis Laurentii Salvii.
  4. 1 2 3 "Circaea canadensis (L.) Hill". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 16 August 2022.
  5. ↑ "enchanter's nightshade". Oxford Dictionaries. Archived from the original on March 4, 2016.
  6. ↑ Berry, Paul E.; William J. Hahn; Kenneth J. Sytsma; Jocelyn C. Hall & Austin Mast (2004). "Phylogenetic relationships and biogeography of Fuchsia (Onagraceae) based on noncoding nuclear and chloroplast DNA data". American Journal of Botany. 91 (4): 601–14. doi:10.3732/ajb.91.4.601. PMID   21653416.
  7. 1 2 "Circaea alpina L." Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 16 August 2022.
  8. ↑ Gilman, Arthur V. (2015). New Flora of Vermont. Memoirs of The New York Botanical Garden, Volume 110. Bronx, New York, USA: The New York Botanical Garden Press. ISBN   978-0-89327-516-7.
  9. ↑ Chen, Jiarui; Boufford, David E. "Circaea". Flora of China. Vol. 13 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  10. ↑ "Circaea lutetiana L." Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 18 August 2022.
  11. ↑ "Circaea". State-level distribution maps from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014. Retrieved 19 August 2022.
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