Poplar 45, 159 balsam 291 blue 159 Carolina 47, 49 hickory 159 Lombardy 292 silver-leaf 45, 46 swamp 47 white 159 yellow 159, 160, 298 =Populus= =45= =alba= =45=, 46 =balsamifera= =291= _balsamifera_ variety _virginiana_ _47_ =candicans= =292= =deltoides= =47=, 49, 297, 300 =grandidentata= =50=, 51, 291, 297, 300 =heterophylla= =47=, 48, 297, 300 =nigra= variety =italica= =292= =tremuloides= =52=, 53, 297, 300 Preface 7 Privet swamp 300 =Prunus= =216= =americana= =216=, 217, 299 =americana= variety =lanata= =218=, 219 =hortulana= =221=, 222 =nigra= =218=, 220 =pennsylvanica= =223=, 224, 300 =serotina= =223=, 225, 300 Quaking aspen 52, 300