Thread-leaved sundew (Drosera filiformis) COSEWIC assessment and status report: chapter 8

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Studies of the Swaines Road Bog, Port La Tour Bog, West Baccaro Bog, and Quinns Meadow in 1991 found average densities of the thread-leaved sundew of 12-40/m² and up to 90/m² (Freedman et al., 1991). Studies of the Villagedale Bog in 1999 found a density of up to 50/m² (flowering plants only; J. Jotcham, unpublished data).

Accurate measurements have not been made of the sizes of the populations of thread-leaved sundew at its five known critical habitats in Nova Scotia. However, there appear to be tens of thousands of plants in each of the Swaines Road Bog, Port La Tour Bog, and Villagedale Bog, and additional thousands more in the West Baccaro Bog and Quinns Meadow (Freedman et al., 1991; J. Jotcham, unpublished data).

The populations of thread-leaved sundew have not been monitored at any of its known sites. During at least the past decade, however, the habitat appears to have been stable, and so likely have been the populations of the rare sundew.