Morus rubra, L. 102 Populus heterophylla, L. 33 Quercus Muhlenbergii, Engelm. 84 Thuja occidentalis, L. 23 BISSELL, C. H. v Crataegus Crus-Galli, L. 117 Pinus sylvestris, L. (_in lit._, 1899) 12 Prunus Americana, Marsh. (_in lit._, 1900) 123 Rhus copallina 137 BRAINERD, EZRA Carya porcina, Nutt. 53 Crataegus punctata, Jacq. 118 Ulmus racemosa, Thomas 99 BREWSTER, WILLIAM Pinus Banksiana, Lamb 8 BRITTON, NATHANIEL LORD Acer Saccharum, _var._ nigrum 172 BROWNE, D. T. Ilex opaca (_Trees of North America_, 1846) 139 _Bulletin Torrey Botanical Club_, XVIII, 150 Pinus Banksiana, Lamb 8 CHAMBERLAIN, E. B. Ulmus fulva, Michx. (1898) 97 CHURCHILL, J. R. Prunus Americana, Marsh. 123 COLLINS, J. F. v Gleditsia triacanthos, L. 129 DAME. L. L. Crataegus Crus-Galli, L. 171 Salix fragilis, L. (_Typical Elms and other Trees of Massachusetts_, p. 85) 44 DAY, F. M. Pinus Banksiana, Lamb 8 DEANE, WALTER Sassafras officinale, Nees (1895) 106 DUDLEY, W. R. Populus heterophylla, L. 33 EGGLESTON, W.W. Carya porcina, Nutt. 53 Celtis occidentalis, L. 100 Morus rubra, L. 102 Platanus occidentalis, L. 110 Populus deltoides, Marsh. 34 Sassafras officinale, Nees. 106 Ulmus racemosa, Thomas. 99 ENGLER, ADOLPH v