190 TREES OF NEW ENGLAND. 



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



Plane tree family. (Platanaceae) 110, 111 



Platanaceae. (Plane tree family) 110, 111 



.. _ (Buttonwood, Sycamore, Button-) 



Platanus occidentals, L. ] _ 77 _. ' . 110,111 



( ball, Plane tree ) 



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 " 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. ... " 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 " " . . 112,113 



sambucifolia, Rcem " " . . 113. 115 



Poplar, Tulip tree, Whitewood. (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 hete- 



rophylla, 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 



{Balsam. Poplar, Balm) 

 balsamifera, var. intermedia < _ ' , 



( of Gilead . . . . ) 



