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Contact information
For information on Wisconsin's rare plants, contact:
Kevin Doyle
608-267-9788

Linear-leaved Sundew (Drosera linearis)

Life history

Species overview

Linear-leaved Sundew (Drosera linearis), a Wisconsin Threatened plant, is found on open bog and fen mats. Blooming occurs early June through early August; fruiting occurs early July through late August. The optimal identification period for this species is late June through late August.

Synonyms: None

Identification

  • Distinguishing characteristics: Distinguished mostly easily by its leaves, which are 7 to 20 times as long as wide and its petals, which are usually pinkish.
  • Flower characteristics: Flowers 1 to 4 atop stalks; petals pinkish or sometimes white, obovate.
  • Fruit characteristics: Dry, many-seeded capsule; seeds black, less than 1 mm long, with small craterlike pits on surface.
  • Leaf characteristics: All from base of plant, covered with stalked, sticky glands that trap and digest insects, upright, longer than wide; blades linear; petioles smooth.

Phenology

  • Blooming phenology: early June through early August
  • Fruiting phenology: early July through late August
  • Optimum time to identify: late June through late August

Other

  • Growth form: Forb-erect
  • Vegetative reproduction:
  • Life cycle: Perennial
  • Comments: Associated Species: Carex spp., Sphagnum spp.

State status

Status and Natural Heritage Inventory documented occurrences in Wisconsin

The table below provides information about the protected status - state and federal - and the rank (S and G Ranks) for Linear-leaved Sundew (Drosera linearis). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where this species has been found to date and is not meant as a range map.

Documented locations of Drosera linearis in the Natural Heritage Inventory Database as of July 2015.


Summary Information
State StatusTHR
Federal Status in Wisconsinnone
State RankS1
Global RankG4
Tracked by NHIY

Habitats and landscapes

The Natural Heritage Inventory has developed scores indicating the degree to which each of Wisconsin's rare plant species is associated with a particular natural community or ecological landscape. This information is similar to that found in the Wildlife Action Plan for animals. As this is a work in progress, we welcome your suggestions and feedback.

General habitat information

  • Habitat description: Found on open bog and fen mats.
  • Soils: Wet, calcareous soils.

Natural communities

This table lists the natural communities that are associated with Linear-leaved Sundew. Scores for natural community associations are: "significant" association (score=3), "moderate association" (score=2) or the species can be present but is only weakly associated with the community (score=1).

Natural communities score
Patterned Peatland 2
Boreal Rich Fen 2
Poor Fen 2

Ecological landscapes

This table lists the ecological landscape association scores for Linear-leaved Sundew. The scores (3=High, 2=Moderate, 1=Low, 0=None) also correspond to the map.

Map of the Ecological Landscapes of Wisconsin.

Species guidance

The Endangered Resources Program has developed avoidance measures and management guidelines for plants on the Natural Heritage Working List. These are a work in progress, and we welcome your suggestions and feedback. Sources used in developing this information can be found here.

Avoidance measures

These are specific actions designed to avoid "take" (mortality) of this species.

  • Avoid known individual plant locations and conduct operations elsewhere when they are least likely to cause damage. Ideally, this would involve frozen, snow-covered ground. However, in areas of the state where frozen conditions are unreliable, very dry soils late in the growing season might be the best available alternative. Consult with a biologist, if needed.
  • Avoid broadcast spraying of herbicides; use care with spot spraying.

Management guidance

Management guidelines are additional considerations that may help maintain or enhance habitat for this species

  • Survey for and control invasive plants prior to conducting timber operations, as these can be spread by vehicles and often respond vigorously to increased light; see forestry BMPs for invasive species.
  • Minimize disturbance to hydrology, including soil disturbance from rutting.
  • This species is likely sensitive to water quality. Following BMPs around streams and buffering associated drainages will reduce eutrophication and prevent water quality degradation.
  • Avoid rapid and dramatic reductions in canopy cover or basal area in wet areas to reduce risk of swamping.

Photos


Linear-leaved Sundew  Photo.

Photo ©  Wisconsin DNR.

Linear-leaved Sundew  Photo.

Photo © Hugh Iltis, Wisconsin State Herbarium

Linear-leaved Sundew  Photo.

Photo by  staff, Wisconsin DNR.

Linear-leaved Sundew  Photo.

Photo © Steve Janke, Wisconsin State Herbarium

Linear-leaved Sundew  Photo.

Photo © Steve Janke, Wisconsin State Herbarium

Linear-leaved Sundew  Photo.

Photo © Mike Reese.


Support for Wisconsin's rare plant information has been provided by the Division of Forestry, the Endangered Resources Fund and the Wisconsin Rare Plant Preservation Fund. To donate, visit the Natural Resources Foundation of Wisconsin [exit DNR].

Last revised: Tuesday, November 28, 2017
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