align="left">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