Published on the occasion of the 21st session of the International Poplar Commission in association with The Poplar Council of Canada and the Poplar Council of the United States. This book describes the status of culture and utilization of poplars in North America and documents succinctly recent scientific and technological advances. Gathering under one cover important source information about North American poplars for the benefit of poplar growers and scientists, the book provides perspectives on the current status and future prospects of all aspects of the poplar sector. The scope of the work includes all Populus species native to Canada and the United States, naturally-occurring hybrids and varieties, as well as cultivars in current regular use. The first part of the book, with ten chapters prepared by 27 U.S. and Canadian editors, summarizes practical knowledge on growing and using poplars. Included are chapters describing natural species, varieties, and provenances; poplar breeding techniques and strategies; the physiological ecology of poplars; the silviculture and ecology of natural stands; the silviculture and ecology of plantations; the use of poplars in urban plantings, windbreaks, and phytoremediation; poplar insects; poplar diseases; and wood properties and utilization of poplars. The second part, with 4 chapters prepared by 5 editors, describes the characteristics of the principal poplar clones and cultivars in use in North America. Included are discussions of clonal morphology, phenology, sensitivity to insects and pathogens, growth, site relations, wood properties, importance, and regional suitability. The second part also reviews the breeding strategies that may be used for poplars in the 21st century.