Species Profile

Thread-leaved Sundew

Scientific Name: Drosera filiformis
Taxonomy Group: Vascular Plants
Range: Nova Scotia
Last COSEWIC Assessment: May 2001
Last COSEWIC Designation: Endangered
SARA Status: Schedule 1, Endangered


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Quick Links: | Photo | Description | Distribution and Population | Habitat | Biology | Threats | Protection | Recovery Initiatives | Recovery Team | National Recovery Program | Documents

Image of Thread-leaved Sundew

Thread-leaved Sundew Photo 1
Thread-leaved Sundew Photo 2

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Description

The Thread-leaved Sundew is a perennial, carnivorous herb which grows to a height of 15 to 25 cm. The long and threadlike leaves rise from the base of the plant. Numerous reddish-purple, sticky, hair-like glands cover the leaves. These glands release a sticky liquid which traps small arthropods (insects and spiders). The flowers are purple with yellow centres; they have five petals; they grow on stems that have no leaves; and they open one at a time.

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Distribution and Population

The Thread-leaved Sundew occurs in Canada and the eastern United States, ranging from a few populations in coastal New England to more abundant ones on the Gulf Coast of Florida and Louisiana. In Canada, the Thread-leaved Sundew is found only in five bogs in a small area of extreme southwestern Nova Scotia. The total population of the Thread-leaved Sundew amounts to tens of thousands of plants, but it only occurs in five known populations located within about 10 km of each other.

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Habitat

The Thread-leaved Sundew grows in a variety of habitats, including damp sands, sandy shores, and cedar swamps. In Nova Scotia it occurs only in raised (or plateau) bogs. These are infertile, acidic open wetlands dominated by peat mosses, heath shrubs, short sedges and grasses.

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Biology

In Canada, the Thread-leaved Sundew begins flowering in mid to late July. There is an average of 8 capsules per plant, each containing about 70 seeds. This plant appears to be pollinated by insects, and to reproduce through its seeds. The Thread-leaved Sundew grows in distinct colonies. It captures small invertebrates on its sticky leaves, which are digested by enzymes contained in the droplets. It is also capable of photosynthesis.

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Threats

One of the largest populations of the Thread-leaved Sundew is threatened by a proposal to develop a peat mine, which would destroy or degrade its habitat. The other four known populations are also potentially threatened by proposals to develop peat mines or cranberry farms.

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Protection

Federal Protection

The Thread-leaved Sundew is protected under the federal Species at Risk Act (SARA). More information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.

The Thread-leaved Sundew is protected by the Nova Scotia Endangered Species Act. Under this Act, it is prohibited to kill, harm, or collect this species.

Provincial and Territorial Protection

To know if this species is protected by provincial or territorial laws, consult the provinces' and territories' websites.

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Recovery Initiatives

Status of Recovery Planning

Recovery Strategies :

Name Recovery Strategy and Management Plan for Multiple Species of Atlantic Coastal Plain Flora in Canada
Status Final posting on SAR registry

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Recovery Team

Atlantic Coastal Plain Flora Recovery Team

  • Sherman Boates - Chair/Contact - Government of Nova Scotia
    Phone: 902-679-6146  Fax: 902-679-6176  Send Email
  • Samara Eaton - Chair/Contact - Environment Canada
    Phone: 506-364-5060  Fax: 506-364-5062  Send Email

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Documents

PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.

6 record(s) found.

COSEWIC Status Reports

  • COSEWIC assessment and update status report on the thread-leaved sundew Drosera filiformis in Canada (2001)

    Thread-leaved sundew is a small, rare carnivorous wildflower that only grows in bogs. It produces up to 15 purplish flowers with yellow centers on the elongate, leafless flowering stalk that often forms a broad crook at its tip. It is an herbaceous perennial that grows long, erect, thread-like leaves each summer from a whitish tuber. Numerous reddish-purple, sticky, hair-like glands cover the leaves and trap small arthropods (insects and spiders). Enzymes in the droplets digest the trapped victims that serve as an additional source of nutrients.

COSEWIC Assessments

Recovery Strategies

  • Recovery Strategy and Management Plan for Multiple Species of Atlantic Coastal Plain Flora in Canada (2016)

    Section 37 of SARA requires the competent minister to prepare recovery strategies for listed extirpated, endangered or threatened species and Section 65 of SARA requires the competent minister to prepare management plans for special concern species. For the SARA-listed species of Special Concern, their inclusion in this combined recovery strategy and management plan will also serve in lieu of a separate management plan as required under SARA (Sections 65-67). The Province of Nova Scotia, Environment Canada, and Parks Canada Agency led the development of this document. This recovery strategy and management plan was developed in cooperation or consultation with numerous other individuals and agencies including environmental non-government organizations, industry stakeholders, aboriginal groups, and private landowners.

Action Plans

  • Action Plan for Multiple Species of Atlantic Coastal Plain Flora in Canada [Proposed] (2016)

    The Minister of Environment and Climate Change is the competent minister under SARA for the Pink Coreopsis, Thread-leaved Sundew, Water Pennywort, Goldencrest and Plymouth Gentian and has prepared this action plan to implement the recovery strategy, as per section 47 of SARA. The minister responsible for the Parks Canada Agency (PCA) is a competent minister for the Water Pennywort, where the species occurs on lands administered by PCA. To the extent possible, it has been prepared in cooperation with the Province of Nova Scotia, the Atlantic Coastal Plain Flora (ACPF) Recovery Team, environmental non-government organizations, industry stakeholders, aboriginal groups, and private landowners, as per section 48(1) of SARA.

Management Plans

  • Recovery Strategy and Management Plan for Multiple Species of Atlantic Coastal Plain Flora in Canada (2010)

    Section 37 of SARA requires the competent minister to prepare recovery strategies for listed extirpated, endangered or threatened species and Section 65 of SARA requires the competent minister to prepare management plans for special concern species. For the SARA-listed species of Special Concern, their inclusion in this combined recovery strategy and management plan will also serve in lieu of a separate management plan as required under SARA (Sections 65-67). The Province of Nova Scotia, Environment Canada, and Parks Canada Agency led the development of this document. This recovery strategy and management plan was developed in cooperation or consultation with numerous other individuals and agencies including environmental non-government organizations, industry stakeholders, aboriginal groups, and private landowners.

Residence Description

  • Residence Rationale - Thread-leaved Sundew (2007)

    Individual Thread-leaved Sundew plants do not appear to use a dwelling place similar to a nest or den, and therefore do not qualify for having a residence. There would be no additional legal protection not already afforded by protection of the individual and its critical habitat.