i #2 i 
z ; 
i, XL No. re 
THE 
BoTANICAL GAZETTE 
July, 1906 
Editors: JOHN M. COULTER and CHARLES R. BARNES 
CONTENTS 
On Cretaceous Pityoxyla E. C. Jeffrey and M. A. Chrysler 
A Study of the Vegetation of the Mesa Region East 
of Pike’s Peak: the Bouteloua Formation H. L. Shantz 
Contributions from the Rocky Mountain Herbarium. 
Vil Aven Nelson 
Briefer Articles 
Anthoceros and its Nostoc Colonies Gevrge J. Peirce 
Distribution and Habits of Some Common Oaks E. J. Hill 
Current Literature 
News 
The University of Chicago Press 
CHICAGO and NEW YORK 
William Wesley and Son, Loudon 
