TO
M. R. S.
THE WISE AND KIND FRIEND OF THIRTY YEARS
THIS BOOK IS DEDICATED
WITH GRATITUDE AND AFFECTION

PREFACE TO THE SECOND EDITION

The studies of the trees of North America (exclusive of Mexico) which have been carriedon by the agents and correspondents of the Arboretum in the sixteen years since the publicationof the Manual of the Trees of North America have increased the knowledge ofthe subject and made necessary a new edition of this Manual. The explorations of thesesixteen years have added eighty-nine species of trees and many recently distinguishedvarieties of formerly imperfectly understood species to the silva of the United States, andmade available much additional information in regard to the geographical distribution ofAmerican trees. Further studies have made the reduction of seven species of the first editionto varieties of other species seem desirable; and two species, Amelanchier obovalis andCercocarpus parvifolius, which were formerly considered trees, but are more properlyshrubs, are omitted. The genus Anamomis is now united with Eugenia; and the ArizonaPinus strobiformis Sarg. (not Engelm.) is now referred to Pinus flexilis James.

Representatives of four Families and sixteen Genera which did not appear in the firstedition are described in the new edition in which will be found an account of seven hundredand seventeen species of trees in one hundred and eighty-five genera, illustrated by sevenhundred and eighty-three figures, or one hun

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