SEEN ee ee nes 
The Botanical Gazette 
A Aontbly Fournal Embracing all Departments of Botanical Science 
Edited by JOHN M. CouULTER and CHARLES R. BARNES, with the assistance of other members of the 
botanical staff of the Uaiversiays of Chicago. 
Vol. XLII, No. 1 : Issued July 28, 1906 
5 CONTENTS 
ON CRETACEOUS PITYOXYLA (wirH PLATES I AND m1). £.C. Jeffrey and M. A. Chrysler - I 
A STUDY OF THE VEGETATION OF THE MESA REGION EAST OF PIKE’S PEAK: 
E BOUTELOUA FORMATION (wirH Map AND SEVEN FIGURES). H.L. Shantz - 16 
CONTRIBUTIONS FROM THE ROCKY MOUNTAIN HERBARIUM. VII. Aven Nelson 48 
“BRIEFER ARTICLES. 
NTHOCEROS AND ITS Nostoc CoLontes. George J. Peirce - =" . i 55 
a DISTRIBUTION AND Hasirs oF SomME ComMMoN Oaks. E. J. Hill - - - - - 59 
CURRENT LITERATURE. 
BOOK REVIEWS - = ‘ ; = = ‘ S 60 
EVOLUTION. 
a CHEMISTRY OF PLANTS. 
4 MINOR NOTIC = = : = 2 
- - - - - . - - 62 
; NOTES FOR eae - - - - - - . - - - ” 5 : 63 
NEWS - it s ‘ i s : a 3 s e = E 79 
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