tae, White cedar_ 23, 24

Pitch pine. (Pinus rigida. Mill.) 6, 7

Plane tree family. (=Platanaceae=) 110, 111
=Platanaceae.= (Plane tree family) 110, 111

Platanus occidentalis, L. _Buttonwood, Sycamore. Buttonball,
Plane tree_ 110, 111

Plum family. (=Drupaceae=) 122-128

Plum, Wild plum. (Prunus Americana, Marsh.) 123, 124, 171
Wild, Red, Horse, Canada plum. (Prunus nigra, Ait.) 122, 123, 171

Poison elder (Rhus vernix. L.) 136, 137
ivy (Rhus toxicodendron) 137
sumac (Rhus vernix, L.) 136, 137

=Pomaceae.= (Apple family) 112-121
Amelanchier Canadensis, Medic. _Shadbush, June-berry_ 116, 117
Crataegus Arnoldiana, Sarg., _Thorn_ 121
coccinea, L,. _Thorn_ 118, 119
coccinea, _var._ mollis, T. & G. 120, 121
Crus-Galli, L. _Cockspur thorn_ 117, 118, 171
mollis, Scheele _Thorn_ 120, 121
punctata, Jacq....._Cockspur thorn_ 118
submollis, Sarg. _Thorn_ 121
subvillosa, Schr. _Thorn_ 120, 121

Malus malus, Britton _Apple tree_ 115

Pyrus Americana, DC. _Mountain ash_ 112, 113
aucuparia _European mountain ash_ 113, 115
communis, L. _Pear tree_ 115
malus, L. _Apple tree_ 115
sambucifolia, Cham. & Schlecht. _Mountain ash_ 113-115

Sorbus Americana, Marsh. _Mountain ash_ 112, 113
sambucifolia, R[oe]m. _Mountain ash_ 113, 115

Poplar, Tulip tree, White wood. (Liriodendron Tulipifera, L.) 104-106
Aspen. (Populus tremuloides, Michx.) 29, 30
Balsam, Balm of Gilead. (Populus balsamifera. L.) 36, 37
Cottonwood. (Populus deltoides, Marsh.) 34, 35
Poplar, Large-toothed aspen. (Populus grandidentata, Michx.) 31, 32
Swamp poplar, Cottonwood, Poplar. (Populus heterophylla, L.) 33, 34
White, Silver-leaved poplar. (Populus alba, L.) 39, 40

Poplar birch. (Betula populifolia, Marsh.) 66-68

Populus alba, L. _Abele, White, Silver-leaved poplar_ 39, 40
balsamifera, L. _Balsam_ 3, 36, 37
balsamifera, _var._ candicans, Gray. _Balm of Gilead_ 37-39, 171
balsamifera, _var._ intermedia _Balsam, Poplar, Balm of Gilead_ 36

Populus balsamifera, _var._ latifolia _Balsam, Poplar,
Balm of Gilead_ 36
candicans, Ait., _Balm of Gilead_ 37-39, 171
deltoides, Marsh. _Cottonwood, Poplar_ 34, 35
grandidentata, Michx. _Poplar, Large-toothed aspen_ 31, 32
heterophylla, L. _Swamp poplar, Poplar, Cottonwood_ 33, 34
monilifera, Ait. _Co