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Canby's Dropwort was listed as endangered in 1986 because of its rarity and vulnerability to any change in habitat. There are 53 populations left in Maryland, North Carolina, South Carolina, and Georgia, with South Carolina hosting the largest number of this plant. Delaware used to be home to Canby's Dropwort, but it has totally disappeared there. The greatest threat to the plant is alteration or complete loss of wetland habitats to agriculture, ditching, and drainage. Black Swallowtail butterfly larvae have also been identified as a destructive force for this plant, although the degree to which this insect impacts the overall population is unknown.

For more detailed information visit: www.fws.gov or www.centerforplantconservation.org.