The Philippine Journal of Science, C. BoYany. 
' Vol. VI, No. 4, September, 1911. 
PHILIPPINE URTICACEAE, II. 
By C. B. Robinson. 
( From the Botanical Section of the Biological Laboratory, Bureau of Science, 
Manila, P. I.) 
Somewhat intensive botanical explorations have recently been made in 
Benguet, and among the collections are representatives of several species 
not previously obtained. This has also furnished an opportunity to make 
detailed investigations upon various points, where abundance of herbarium 
material furnishes controls, so that the results obtained can be checked 
by many workers. Somewhat unexpectedly, although it should not have 
been, one collection has rendered necessary a complete revision of the 
statements which have been made in many works regarding the genus 
Pipturus. Less numerous collections have been received from other parts 
of the Islands. Nothing is herein cited unless some light has been thrown 
upon the species concerned. The numbers placed with the species indicate 
their sequence in comparison with those enumerated in my previous paper. 
9. ELATOSTEMA Forst. p. p. 
In this genus the need for characters that can be depended on as 
constant is very great. For this reason, a test has been made of the 
reliability of tetramerous as contrasted with pentamerous staminate 
flowers. Practically no attention has been paid to this in the past, most 
workers recording the facts as a matter of routine in describing species, 
but no one basing conclusions upon them. This is used in Pouzolzia and 
Oonostegia ( Memorialis ) as one of the main bases of separation , 1 but so 
far as Philippine experience goes, it is less constant in these genera 2 than 
in Elatostema. Much of the material examined was hardened in alcohol 
1 Hook. f. FI. Br. Ind. 5 (1888) 580. 
2 See This Journal 6 (1911) Bot. 8, 10. 
299 
