By Reinhard Friedrich Stettler
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Extra info for Biology of populus and its implications for management and conservation
There are a number of subgroups (tribes) within the Flacourtiaceae that show similarities to Populus or Salix, and these tribes are not all considered closely related to one another (Sleumer 1980). Much work needs to be done on the Flacourtiaceae and related families before the Salicaceae can take their proper place among them, but an important consequence of this connection is to challenge our usual view of the cool temperate Page 14 origin of poplars. Although thought of as northern, because their greatest ecological importance is in the boreal forest region, the taxonomic diversity of poplars reaches its peak in warm temperate to subtropical latitudes across the northern hemisphere.
B: P. deltoides subsp. monilifera. C: P. grandidentata. D: P. '< are the primary basis for defining sections of the genus (Table 1 and further discussion below). Technical features Poplars have been recognized as a group since very early times and have a unique combination of characteristics that distinguish them from all other genera of plants. The defining features are primarily in the reproductive structures. Like many other wind-pollinated trees, the flowers are borne in pendent racemes (catkins, aments) that vary in flower number and density among poplar species and sections but are generally similar for males and females of the same species.
Johnson, D. Karnosky, M. Krasny, P. Larson, Y. Linhart, T. Martin, S. Merkle, M. Ostry, S. Pallardy, S. Pezeshki, J. Pinon, P. Schulte, J. Stromberg, C. Tauer, M. Tjoelker, M. Villar, N. Wheeler, R. Wu, S. Wullschleger, and G. Wyckoff. We are indebted to them for their efforts. Special thanks go to Lynn Catlett who provided invaluable staff assistance from the beginning to the end of the project. Daniel and Andrea Stettler offered their graphics expertise for the design of the book cover. Finally, we express our gratitude to Gerry Neville and Nancy Daly at NRC Research Press for their patient guidance throughout all phases of the book's genesis.
Biology of populus and its implications for management and conservation by Reinhard Friedrich Stettler