=Aceraceae.= (Maple family). 140-153 Acer barbatum, Michx. _Rock, Sugar, Hard maple, Sugar tree_ 144-146 barbatum, var. nigrum, Sarg. _Black maple_ 146, 147 dasycarpum, Ehrh. _Silver, Soft, White, River maple_ 142-144 Negundo, L. _Box elder, Ash-leaved maple_ 151-153 nigrum, Michx. _Black maple_ 146,147 Pennsylvanicum, L. _Striped maple, Moosewood, Whistlewood_ 149-151 platanoides _Norway maple_ 146 rubrum, L. _Red, Swamp, Soft, White maple_ 140-142 saccharinum, L. _Silver, Soft, White, River maple_ 142-144 saccharinum, Wang. _Rocky Sugar, Hard maple, Sugar tree_ 144-146 saccharinum, var. nigrum, T. and G. _Black maple_ 146, 147 Saccharum, Marsh. _Rock, Sugar, Hard maple, Sugar tree_ 144-146 Saccharum, Marsh., var. barbatum, Trelease 172 Saccharum, Marsh., var. nigrum, Britton. _Black maple_ 146, 147, 172 spicatum, Lam. _Mountain maple_ 148, 149 Negundo aceroides, Moench. _Box elder, Ash-leaved maple_ 151-153 Negundo, Karst, _Box elder, Ash-leaved maple_ 151-153 Ailanthus family. (=Simarubaceae=) 133 Ailanthus, Tree of Heaven, Chinese sumac (Ailanthus glanulosus, Desf.) 133 Alder, European. (Alnus glutinosa, Medic.) 70 Alnus glutinosa, Medic, _European alder_ 70 Amelanchier Canadensis, Medic. _Shadbush, June-berry_, 116, 117 American elm (Ulmus Americana, L.) 95-97 holly. (Hex opaca, Alt.) 138-146 =Anacardiaceae.= (Sumac family) 134-137 Rhus copallina. _Dwarf sumac_, 137 glabra. _Smooth sumac_, 137 hirta, Sudw. _Staghorn sumac_, 134, 135 toxicodendron. _Poison ivy_, 137 typhina, L. _Staghorn sumac_, 134, 135 venenata, DC. _Dogwood, Poison sumac. Poison elder_, 136, 137 vernix, L. _Dogwood, Poison sumac. Poison elder_, 136, 137 Apple family. (=Pomaceae=) 112-121 Apple tree. (Pyrus malus, L.) 1 =Aquifoliaceae.= (Holly family) 138-140 Ilex opaca, Ait. _American holly_ 138, 140 Ash, Black, Swamp, Basket, Hoop, Brown ash. (Fraxinus nigra, Marsh.) 167-168 European mountain ash. (Pyrus aucuparia) 113, 115 Green ash. (Fraxinus Pennsylvanica, var. lanceolata, Sarg.) 166, 172 Mountain ash. (Pyrus Americana, DC.) 112, 113 Mountain ash. (Pyrus sambucifolia, Cham. & Schlecht.) 113-115 Red, Brown, River ash. (Fraxinus pubescens. Lam.) 164,165 White ash. (Fraxinus Americana, L.) 162-164 Ash-leaved maple. (Acer negundo, L.) 151-153 Aspen, Large-toothed. (Populusgrandidentata, Michx.) 31, 32 (Populus tremuloides, Michx.) 29, 30 B Balm of Gilead. (Populus balsamifera, L.) 36, 37 (Populus candicans, Alt.). 37-39, 171 Balsam. (Abies balsamea, Mill.) 20-22 (Populus balsamifera, L.) 36, 37 Basket ash. (Fraxinus nigra, Marsh.) 167, 168