The Garden participates in an ambitious, bi-national project to produce the Flora of North America, the first comprehensive description of all the estimated 21,000 plants that grow spontaneously in the United States, Canada and Greenland. The project coordinates the contributions of hundreds of collaborators at 30 institutions in the U.S. and Canada. Thirty volumes are planned and several have already been published by Oxford University Press. The project is scheduled for completion in 2010.