Thread-leaved sundew (Drosera filiformis) COSEWIC assessment and status report: chapter 11

Existing Protection or Other Status

Thread-leaved sundew was listed as “endangered” in Canada by COSEWIC in 1991 (Zinck, 1991). In 2000 it was listed as endangered by the government of Nova Scotia. The U.S. Fish and Wildlife Service does not list thread-leaved sundew as being at risk on a national basis. However, some eastern states consider it to be at risk (to varying degrees in Connecticut, Florida, Georgia, Maine, Massachusetts, New York, North Carolina, Rhode Island, Vermont, West Virginia).

Assessment of Status and Authors' Recommendation

Thread-leaved sundew appears to be well established at all of its five known critical habitats in Nova Scotia, albeit at varying population levels. Its populations are most vigorous and reproducing best at the Swaines Road Bog, Port La Tour Bog, and Villagedale Bog. Because the Thread-leaved Sundew is known from only five sites, and all are actually or potentially threatened by destruction or degradation by peat mining or conversion to cranberry farming, it is recommended that the status of “endangered” be retained.

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