INDEX. 193 



Salicaceae. (Willow family) Continued. PAGES 



Populus grandidentata, Michx. Poplar, Large-toothed aspen 31,32 



heterophylla, L. Poplar, Swamp poplar, Cottonwood 33,34 



monilifera, Ait. . . Cottonwood poplar .... 34, 35 



tremuloides, Michx. . Poplar, Aspen 29,30 



Salix alba, L White willow 43. 45, 46 



var. coerulea, Koch u " 45 



var. vitellina, Koch " " 45 



balsamifera, Barrett 171 



discolor, Muhl. . Pussy willow, Glaucous willow . 40,41.171 



falcata, Pursh . . Black willow 42 



fragilis, L. . . . Crack willow, Brittle willow . . . 43-45 



nigra, Marsh. . . Black willow 42, 43 



Sassafras officinale, Nees . Sassafras 106-108 



Sassafras, Karst. " 106-108 



Savin (Juniperus Virginiana, L.) . . . 26-28 



Scarlet oak (Quercus coccinea, Wang.) . . . 88,89 



Scotch pine (Pinus sylvestris, L.) 11,12 



Scrub chestnut oak . . . (Quercus prinoides, Willd.) ... 85 



oak (Quercus ilicifolia, Wang.) ... 93, 94 



pine (Pinus Banksiana, Lamb) ... 8, 9 



white oak .... (Quercus prinoides, Willd.) ... 85 



Shadbush (Amelanchier Canadensis, Medic.) 116,117 



Shagbark (Carya alba, Nutt.) 49-51 



Sheep berry (Viburnum Lentago, L.) . . . . 168, 169 



Silver-leaf poplar .... (Populus alba, L.) 39, 40 



maple .... (Acer saccharinum, L.) . . . . 142-144 



Simarubaceae. (Ailanthus family) 133 



Ailanthus glandulosus, Desf. Tree of Heaven, Chinese sumac 133 



Skunk spruce (Picea alba, Link) .... 16-18 



Slippery elm (Ulmus fulva, Michx.) ... 97, 98 



Small white birch (Betula populifera, Marsh.) . 66-68 



Smooth sumac (Rhus glabra) 137 



Soft maple . . (Acer rubrum, L.) . . . . . 140-142 



(Acer saccharinum, L.) . . . 142-144 



Sorbus Americana, Marsh. . Mountain ash 112, 113 



sambucifolia, Roam. . " ...... 113.115 



Sour gum . . (Nyssa sylvatica, Marsh.) . . 159, 160 



Spruce, Black, Swamp, Double, Water. (Picea nigra, Link) . 12-14 



Red spruce (Picea rubra, Link) . 15, 16 



White, Cat, Skunk, Labrador. (Picea alba, Link) . 16-18 



Spruce pine . . (Pinus Banksiana, Lamb) 8, 9 



Staghorn sumac. (Rhus typhina, L.) 134, 135 



Striped maple . (Acer Pennsylvanicum, L.) 149-151 



Sugar berry . . (Celtis occidentals, L.) 100-102 



