Originally published as Flora Arctica URSS, Volumes 5 and 6. This long-awaited third volume of six includes treatments of the following nine families: Salicaceae, Betulaceae, Urticaceae, Polygonaceae, Chenopodiaceae, Portulacaceae, Caryophyllaceae, Paeoniaceae and Ranunculaceae. The discussions are illustrated with 166 distribution maps. Once completed, the six volumes of the series will treat about 360 genera, 1650 species and 220 infraspecific taxa. Keys to all genera and species, as well as extensive morphological, ecological and geographical discussions of species characteristic of the Arctic are included.