EXPLANATION OF PLATES. In all, the buds are enlarged three diameters, and the acorns and cupules are of natural size. No special care has been taken in the selection of material, except to get mature winter buds because the differences are less evident while they are developing, and to pick out average fruits from the varying assemblage presented by each species. PLATE X. BLACK OAKS.—I, Quercus marilandica; 2, Q. Catesbæi; 3, Q. digitata; 4, Q. velutina. PLATE XI. SCARLET OAKS.-1, Quercus coccinea; 2, Q. ellipsoidalis; 3, Q. texana (the northern form known also as Q. Schneckii); 4, Q. texana (from Texas); 5, Q. rubra; 6, Q. nana. PLATE XII. SWAMP OAKS.-Water Oaks: 1, Quercus palustris; 2, Q. nigra; 3, Q. georgiana. Willow Oaks: 4, Quercus imbricaria; 5, Q. Phellos; 6. Q. laurifolia; 7, Q. pumila; 8, Q. brevifolia; 9, Q. myrtifolia. PLATE XIII. WESTERN BLACK OAKS.-Olive Oaks: 1, Quercus hypoleuca; 2, Q. Emoryi. Holly Oaks: 3, Quercus agrifolia; 4, Q. Wislizeni; 5, Q. californica. |