| Atkins, C. G. | Pinus Banksiana, Lamb | 8 |
| Averill, C. K. | | v |
| Populus balsamifera, L. |
| (Rhodora, II, 35) | 36 |
| Prunus Americana, Marsh. | 123 |
| Quercus Muhlenbergii, Engelm. | 84 |
| Bailey, L. H. | Populus candicans, Ait. | 37 |
| Bailey, W. W. | Celtis occidentalis, L. | 100 |
| Fraxinus Pennsylvanica, var. |
| lanceolata, Sarg. | 166 |
| Bartram, William | Quercus tinctoria (1791) | 89 |
| Batchelder, F. W. | Betula nigra, L. | 65 |
| Salix discolor, Muhl. |
| (Laconia, N. H.) | 41 |
| Bates, J. A. | Pinus Banksiana, Lamb | 8 |
| Sassafras officinale, Nees | 106 |
| Bishop, J. N. | | v |
| 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. | 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 |
| Fernald, M. L. | Fraxinus Pennsylvania, Marsh, var. lanceolata, Sarg. (in lit., Sept., 1901) | 172 |
| Gleditsia triacanthos, L. | 129 |
| Populus balsamifera, L. var. candicans, |
| Gray (Rhodora. III, 233) | 171 |
| Salix balsamifera, Barratt. | 171 |
| Salix discolor, Muhl. (in lit., Sept., 1901) | 171 |
| Flagg | Morus rubra, L. | 102 |
| Flint, W. F. | | v |
| Acer Negundo, L. | 151 |
| Quercus alba, L. | 75 |
| Flora of Vermont | Betula lenta, L. (1900) | 61 |
| Cratægus Crus-Galli, L. (1900) | 117 |
| Fraxinus Pennsylvanica, Marsh. (1900) | 164 |
| Picea nigra, Link (1900) | 12 |
| Pinus rigida, Mill (1900) | 6 |
| Populus deltoides, Marsh. (1900) | 34 |
| Quercus alba, L. (1900) | 75 |
| Furbish, Miss Kate | Cratægus coccinea, L. (May, 1899) | 119 |
| Pinus Banksiana, Lamb | 8 |
| Goodale, G. L. | Pinus Banksiana. Lamb | 8 |
| Grant | Sassafras officinale, Nees | 106 |
| Gray, Asa | Ilex opaca, Ait. (Manual of Botany, 6th ed.) | 138 |
| Haines, Mrs. | Pinus Banksiana, Lamb | 8 |
| Harger, E. B. | Picea nigra (Rhodora, II, 126) | 13 |
| Harper, R. M. | Liriodendron Tulipifera, L. (Rhodora II, 122) | 104 |
| Harrington, A. K. | Picea alba, Link | 17 |
| Haskins, T. H. | Ulmus racemosa, Thomas (Garden and Forest, V, 86) | 99 |
| Holmes, Dr. Ezekiel | Nyssa sylvatica, Marsh | 159 |
| Hosford, F. H. | Cratægus mollis, Scheele | 120 |
| Hoyt, Miss Fanny E. | Pinus Banksiana, Lamb | 8 |
| Humphrey, J. E. | Picea alba, Link | 17 |
| Quercus palustris, Du Roi (Amherst Trees) | 91 |
| Jack, J. G. | Cratægus coccinea, L. (1899-1900) | 119 |
| Jessup, Henry Griswold | Carya amara, Nutt | 55 |
| Ulmus racemosa, Thomas | 99 |
| Josselyn, John | Sassafras officinale, Nees (New England Rarities, 1672) | 106 |
| Knowlton, C. H. | Pinus rigida, Mill. (Rhodora, II, 124) | 6 |
| Manning, Warren H. | | vi |
| Matthews, F. Schuyler | Morus rubra. L. | 102 |
| Michaux, fils, François André | Ulmus fulva (Sylva of North America, III, ed. 1853) | 97 |
| Morris, E. L. | | v |
| Morss, Charles H. | | vi |
| Oakes, William | Morus rubra, L. | 102 |
| Parlin, J. C. | Sassafras officinale, Nees (1896) | 106 |
| Prantl, Karl von | | v |
| Pringle, C. G. | Pinus Banksiana, Lamb | 8 |
| Pyrus sambucifolia, Cham. & Schlecht | 113 |
| Quercus Muhlenbergii, Engelm | 84 |
| Rand, E. L. | Pinus Banksiana | 8 |
| Rhodora, III, 234 | Acer Saccharum, Marsh., var. barbatum, Trelease | 172 |
| Acer Saccharum, Marsh., var. nigrum, Britton | 172 |
| Rhodora, III, 58 | Ilex opaca, Ait. | 139 |
| Rhodora, III, 234 | Prunus Americana, Marsh | 171 |
| Robbins, James W. | Sassafras officinale, Nees | 106 |
| Ulmus racemosa, Thomas | 99 |
| Robinson, Dr. B. L. | | vi |
| Robinson, John | Cratægus coccinea, L. (1900) | 119 |
| Robinson, R. E. | Pinus Banksiana, Lamb | 8 |
| Russell, L. W. | Quercus palustris, Du Roi | 92 |
| Quercus stellata. Wang | 77 |
| Sargent, Charles S. | Cratægus coccinea, L. (Botanical Gazette, XXXI, 12, 1901, by permission) | 119 |
| Cratægus mollis, Scheele (Botanical Gazette. XXXI, 7, 223, 1901) | 121 |
| Setchell, W. A. | Populus heterophylla. L. | 33 |
| Stone, W. E. | Quercus palustris. Du Roi (Bull. Torr. Club, IX, 57) | 91 |
| Swan, Dr. C. W. | | vi |
| Terry, Mrs. Emily H. | Picea alba. Link | 17 |
| Trelease, William | Acer Saccharum, Marsh., var. barbatum | 172 |
| Tuckerman, Edward | Betula papyrifera, var. minor, Marsh. | 68 |
| Waghorne, A. C. | Cratægus coccinea, L. (1894) | 119 |