April 1999 – The Center filed a petition with the U.S. Fish and Wildlife Service to list the Holmgren's milk vetch as an endangered species.
2000 – In response to our petition, the Service proposed listing the milk vetch as a federally endangered species.
September 28, 2001 – The Service listed the Holmgren's milk vetch as an endangered species. Critical habitat designation, however, was delayed indefinitely.
2004 – The Center and its allies gave notice of intent to sue the Service for failure to designate critical habitat and produce a recovery plan for the Holmgren's milk vetch.
September 29, 2006 – The Service finally created a recovery plan.
December 27, 2006 – The Service finally designated critical habitat for the species.
2007 – The Service prepared a five-year review of the status of the species and confirmed that the Holmgren's milk vetch was still endangered.