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 



tremuloicles. Michx. . Poplar, Aspen 29. 30 



Salix alba, L White willow 43.45.4''. 



var. ecerulea. Koch " 45 



var. vitellina, Koch " " 45 



balsamifera. Barrett 171 



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



falcata, Pursh . . Black willow 42 



frasrilis, 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.) . . . 88,80 



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



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



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



pine (Pinus Banksiana, Lamb) ... 8.0 



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



Shadbush (Amelanchier Canadensis, Medic.) 116,117 



Shagbark (Carya alba, Xutt.) 49-51 



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



Silve-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->>^ 



Smooth sumac (Rhus glabra) 137 



Soft maple (Acer rub rum. L.) 140-142 



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



Sorbus Americana, Marsh. . Mountain ash 112.113 



sambucifolia, Roem. . ;t " 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, !'> 



White. Tat. 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.) 140-151 



Sugar berry . . (Celtis occidentalis. L.) 100-102 



