Circaea

The ''Circaea'', or enchanter's nightshades, are a genus of flowering plants in the evening primrose family Onagraceae 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.

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.

Taxonomy

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

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, 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.

Taxa

, Plants of the World Online (POWO) accepts eight species and eight subspecies:

* '' Circaea alpina''
** ''Circaea alpina'' subsp. ''alpina''
** ''Circaea alpina'' subsp. ''angustifolia''
** ''Circaea alpina'' subsp. ''caulescens''
** ''Circaea alpina'' subsp. ''imaicola''
** ''Circaea alpina'' subsp. ''micrantha''
** ''Circaea alpina'' subsp. ''pacifica''
* '' Circaea canadensis''
** ''Circaea canadensis'' subsp. ''canadensis''
** ''Circaea canadensis'' subsp. ''quadrisulcata''
* '' Circaea cordata''
* '' Circaea erubescens''
* '' Circaea glabrescens''
* ''Circaea lutetiana''
* '' Circaea mollis''
* '' Circaea repens''

POWO also recognizes eight named hybrids:

* ''Circaea'' × ''decipiens''
* ''Circaea'' × ''dubia''
* ''Circaea'' × ''intermedia''
* ''Circaea'' × ''mentiens''
* ''Circaea'' × ''ovata''
* ''Circaea'' × ''skvortsovii''
* ''Circaea'' × ''sterilis''
* ''Circaea'' × ''taronensis''

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

Distribution

Members of genus ''Circaea'' occur throughout the temperate and boreal forests of the Northern Hemisphere, from near sea level to altitude, and from 10°–70° N latitude. ''Circaea alpina'' is the most widespread species, ranging across North America, Europe, and Asia. Likewise ''Circaea canadensis'' ranges across continents, in North America, European Russia, and Asia. ''Circaea lutetiana'' occurs throughout Europe, ranging eastward to Iran.

Three taxa are known to occur in North America: ''Circaea alpina'', ''Circaea canadensis'', and the hybrid ''Circaea'' × ''sterilis''. ''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.

References

External links

Natural England.
Accessed July 2011


Accessed July 2011


Accessed July 2011
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{{Taxonbar, from=Q158100

Taxa named by Joseph Pitton de Tournefort
Plants described in 1753
Taxa named by Carl Linnaeus
Onagraceae genera