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Celtis occidentalis, L. 100 Fraxinus Pennsylvanica, Marsh. 164 Fraxinus Pennsylvanica, var.lanceolata, Sarg. 166 Juglans nigra, L. (in lit., 1896) 48 Morus rubra, L. 102 Populus heterophylla, L. 33 Quercus Muhlenbergii, Engelm. 84 Thuja occidentalis, L. 23 Bissell, C. H. v Cratægus 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 Cratægus 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. Cratægus 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.