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In commencing the systematic study of a family of plants for North America there is logic in studying first those species which occur in the eastern seaboard of the United States. These were the plants first known in detail, if not necessarily those earliest discovered, on this continent. From Massachusetts to Carolina we are on classic ground, and here the plant-life has been worked over so many times, and each species so often collected, that we may now speak with certainty of nearly all specific identities.The present study is concerned with but a portion of this territory, the counties included within the local flora range, of the Torrey Botanical Club and of the Philadelphia Botanical Club. These combined include all of Connecticut; New York southeast of Columbia, Greene and Delaware counties inclusive; all of New Jersey; Pennsylvania southeast of Pike, Wayne, Lackawanna, Luzerne, Schuylkill, Lebanon, Dauphin and Lancaster counties inclusive; Newcastle county, Delaware; and Cecil county, Maryland. This area is in main part represented in the Torrey Club collection at the New York Botanical Garden, and the portion within approximately fifty miles of Philadelphia in the remarkably full and valuable collection of the PhiladelphiaClub at the Academy of Natural Sciences in that city. To both collections I have had free access, and the records below include data from these, the herbaria of Columbia University, the Brooklyn Botanic Garden, the University of Pennsylvania and several other institutions. To the curators of all I am appreciative.