Forestry Department Food and Agriculture Organization of the United Nations International Poplar Commission Thematic Papers POPLARS AND WILLOWS IN THE WORLD CHAPTER 2 POPLARS AND WILLOWS OF THE WORLD, WITH EMPHASIS ON SILVICULTURALLY IMPORTANT SPECIES Donald I. Dickmann, Julia Kuzovkina October 2008 Forest Resources Development Service Working Paper IPC/9-2 Forest Management Division FAO, Rome, Italy Forestry Department FAO/IPC Poplars and Willows in the World Chapter 2 Poplars and Willows of the World, with Emphasis on Silviculturally Important Species by Donald I. Dickmann Department of Forestry Michigan State University East Lansing, MI 48824-1222 USA Julia Kuzovkina Department of Plant Science The University of Connecticut Storrs, CT 06269-4067 USA Contact information for D. I. Dickmann: Email
[email protected] Phone 517 353 5199 Fax 517 432 1143 “…while this planet has gone cycling on according to the fixed laws of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.” Charles Darwin The Origin of Species, 1859 If any family of woody plants affirms Darwin’s musing, it is the Salicaceae. This family—division Magnoliophyta, class Magnoliopsida (dicots), subclass Dilleniidae, order Salicales—includes the familiar genera Populus (poplars, cottonwoods, and aspens) and Salix (willows, sallows, and osiers)1. Together Populus and Salix comprise 400 to 500 species (Table 2-1), although there is no agreement among taxonomists as to the exact number. Added to those numbers are countless subspecies, varieties, hybrids, and cultivars that together encompass a diversity of morphological forms that, although bordering on the incomprehensible, is beautiful and wonderful nonetheless.