Canada's public works department said the construction of a new international border crossing in Windsor, Ont., poses a threat to two endangered plants.
The department said it's launching an effort to relocate the species before construction of the Detroit River International Crossing in west Windsor ramps up next summer.
It said at least 277 Dense Blazing Star plants and 180 Willow Leaf Aster ramets will be moved between November 2012 and May 2013.
It said the plants will be relocated to the eastern side of Lake St. Clair, near Chatham-Kent.
Earlier this month, the Harper government announced in its latest omnibus bill it will exempt the new Windsor-Detroit bridge from major Canadian environmental laws.
The Conservatives introduced the Bridge to Strengthen Trade Act as a part of the omnibus budget bill tabled in the House of Commons.
Once passed, bridge construction would be immune to laws governing permits, approvals and authorizations, including the Environmental Assessment Act and the Species at Risk Act.