BUREAU OF SCIENCE PUBLICATION No. 18 
VOLUME 2, FASCICLE 4 
EXPLANATORY NOTE 
The present enumeration is an attempt to summarize in con- 
venient form for consultation our present knowledge of Phil- 
ippine flowering plants, and represents a part of the knowledge 
accumulated by the author during a course of about twenty 
years’ study of the problem. In the work an attempt has been 
made to account for all binomials accredited to the Philippine 
flora; to adjust the synonymy when necessary; to include all 
important references to the Philippine botanical literature and 
essential references to extra-Philippine literature; to give the 
habitat, altitudinal range, and Philippine and extra-Philippine 
distribution of each species; to cite illustrative specimens where 
expedient or necessary; and to record all available local names 
for each species. 
It is proposed to issue the present work in fascicles, utilizing 
one volume for the gymnosperms and the monocotyledons and 
two volumes for the dicotyledons. It is planned to publish full 
introductory and explanatory matter in a general introduction 
to be prefixed to Volume 1 when the entire enumeration is com- * . 
pleted. | 
ELMER D. MERRILL, 
MANILA, P. I., August 25, 1921. 
