Circaea alpina (Alpine Enchanter's Nightshade)

Plant Info
Also known as: Small Enchanter's Nightshade, Dwarf Enchanter's Nightshade
Genus:Circaea
Family:Onagraceae (Evening Primrose)
Life cycle:perennial
Origin:native
Habitat:part shade, shade; moist; rich woods, mossy bogs
Bloom season:June - August
Plant height:3 to 12 inches
Wetland Indicator Status:GP: FACW MW: FACW NCNE: FACW
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

Pick an image for a larger view. See the glossary for icon descriptions.

Detailed Information

Flower: Flower shape: 4-petals Cluster type: raceme

[photo of flowers] Cluster of stalked flowers (raceme) at the top of the stem, elongating to about 4 inches in fruit, sometimes with 1 to a few lateral racemes from the base of the cluster. Open flowers are all grouped at the tip of the cluster with fruit developing  on the elongating stem below. Flowers are about 1/8 inch across, have 2 white petals each about 2 mm long, notched to about half their length, alternating with 2 whitish, egg-shaped, sepals about the same length that are spreading to reflexed and can make the flower appear 4-petaled. In the center are 2 white stamens slightly longer than the petals. Individual flower stalks are hairless while the cluster stalk (axis) is sparsely short-hairy.

Leaves and stems: Leaf attachment: opposite Leaf type: simple

[photo of leaves] Leaves are thin, opposite with each pair at right angles to the pair below, ½ to 3 inches (1.5 to 7.5 cm) long and 1/3 to 2¼ inches (to 5.5 cm) wide, hairless, generally egg to heart-shaped with a pointed tip, and coarsely toothed around the edges, the teeth more or less perpendicular to the blade edge (dentate). The top-most pair of leaves is smallest and short stalked to nearly stalkless, those below have narrowly winged stalks up to 1½ inches (4 cm) long. Stems are single, erect and hairless below the flower clusters. Colonies cam form from underground, horizontal stems (rhizomes).

Fruit: Fruit type: barbed Fruit type: capsule/pod

[photo of developing fruit] Fruit is a capsule 1.6 to 2.6 mm (less than 1/8 inch) long and to 1.2 mm wide, rounded at the tip and tapering to the stalk, containing a single seed. The surface lacks any ribs or grooves and is covered in hooked hairs that attach themselves to anything that passes by.

Notes:

Alpine Enchanter's Nightshade is a delicate little plant typically found in rich, cool, moist woods and swampy places, often growing on mossy rocks and logs. A personal observation: while not documented in any reference that I could find, all plants that I have come across (and other images, as well) have the second pair of leaves from the base the largest, the pair at the top quite small, and frequently have exactly 4 pairs of leaves. This may be due to the particular degree of maturity, but it is a curious thing nonetheless.

Related species Common Enchanter's Nightshade (Circaea canadensis a.k.a. C. lutetiana) is a much larger plant with open flowers spread out along the raceme rather than clustered at the top, leaves up to 5 inches long that are more finely toothed, mature capsules are broader and grooved/ribbed, and is common in more degraded woodlands. C. alpina is rarely taller than about 10 inches while its larger cousin is rarely less than a foot tall. There are several subspecies worldwide and 2 recognized in North America, with subsp. pacifica found in the western third of North America, and subsp. alpina a circumboreal subspecies found in Minnesota, the northern half of the US and throughout Canada. The two can hybridize, the hybrid (C. ×sterilis) having intermediate characteristics.

Please visit our sponsors

  • Minnesota Goose Garden

Native Plant Nurseries, Restoration and Landscaping Services ↓

Map of native plant resources in the upper midwest

  • Shooting Star Native Seeds - Native Prairie Grass and Wildflower Seeds
  • Morning Sky Greenery - Native Prairie Plants
  • Natural Shore Technologies - Using science to improve land and water
  • Minnesota Native Landscapes - Your Ecological Problem Solvers
  • Spangle Creek Labs - Native orchids, lab propagated

More photos

Photos by K. Chayka taken in Cook, Itasca and Pine counties.

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: Mary Nett - Itasca County
on: 2018-06-27 15:18:41

found blooming at base of tree in low area on Wabana chain

Posted by: Trish Newhart - Woodbury
on: 2022-07-22 14:08:52

I have some growing under my pine tree.

Posted by: K Chayka
on: 2022-07-22 14:35:16

Trish, in Woodbury I suspect you more likely have Circaea lutetiana instead.

Posted by: B Whaley - Sherburne County
on: 2023-04-13 14:05:56

A couple of small populations in the shade of 60 yr. old white pines next to Uncus Dunes SNA but technically in Sand Dunes State Forest. There has been a recent collection made but not yet represented on the distribution map.

Post a comment

Note: All comments are moderated before posting to keep the riff-raff out. An email address is required, but will not be posted—it will only be used for information exchange between the 2 of us (if needed) and will never be given to a 3rd party without your express permission.

For info on subjects other than plant identification (gardening, invasive species control, edible plants, etc.), please check the links and invasive species pages for additional resources.



(required)




Note: Comments or information about plants outside of Minnesota and neighboring states may not be posted because Id like to keep the focus of this web site centered on Minnesota. Thanks for your understanding.