Scientific Name: Drosera filiformis
Taxonomy Group: Vascular Plants
COSEWIC Range: Nova Scotia
COSEWIC Assessment Date and Status Change: May 2001
COSEWIC Status: Endangered
COSEWIC Status Criteria: A2c
COSEWIC Reason for Designation: Peat bog species occurring in only a few sites highly disjunct from the main range of the species along the Atlantic seaboard and subject to on-going risks of peat extraction.
COSEWIC History of Status Designation: Designated Endangered in April 1991. Status re-examined and confirmed in May 2001.
SARA Status: Schedule 1, Endangered
Date of Listing (yyyy-mm-dd): 2003-06-05
Please note that this information is provided for general information purposes only. For the most up to date and accurate list of species listed under the Species at Risk Act, please see the Justice Laws Website.
Image of Thread-leaved Sundew
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.
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.
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.
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.
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.
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
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
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
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 (1 record(s) found.)
- Recovery Strategies (2 record(s) found.)
- Action Plans (1 record(s) found.)
- Management Plans (1 record(s) found.)
- Residence Description (1 record(s) found.)
COSEWIC Status Reports
Residence Rationale - Thread-leaved Sundew (2007-01-02)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.