VOL. XVII, NO. 10
UNIVERSITY OF MICHIGAN
BOTANICAL GARDEN AND ARBORETUM
A HANDBOOK OF THE NATIVE AND
IMPORTANT INTRODUCED SPECIES
CHARLES HERBERT OTIS, formerly
AN INTRODUCTION BY
GEORGE PLUMER BURNS, formerly
of a bulletin on Michigan trees was first suggested by
Prof. Volney M. Spalding. It was thought that a bulletin
devoted entirely to the study of certain phases of tree
life in Michigan would stimulate interest in the study
of our trees, and influence many more people to
associate themselves with the growing number of tree
lovers and with the supporters of the movement for
better forest conditions in the state.
bulletin has been under consideration for a number of
years and much of the material given herein has been
used in the classes in forest botany at the University
of Michigan. It remained, however, for the present
Curator of the Botanical Garden and Arboretum to get the
material into shape for publication, and the present
bulletin is the result of his industry and perseverance.
The preparation of the drawings and manuscript has been
made by him in connection with his work in the Garden.
distinctive feature of the bulletin lies in its keys.
The keys commonly published are based upon characters
which are present but a short time during the year, or
which can be used only by an advanced student of botany.
This bulletin presents two keys. One is based upon
characters which are present all summer; the other uses