336 The Philippine Journal of Science ms 
typified of course by Balsamo citrus. The genera of the Balsamo- 
citrinae are very different from each other and have many dis- 
tinct characters of taxonomic importance. In other words they 
seem like the widely scattered survivors of a once larger group. 
Subtribe BALSAMOCITRINAE Swingle 
The genera of this subtribe fall into three divisions or super- 
genera: (1) Aegle, Balsamo citrus, and Aeglopsis, with very 
hard-shelled fruits having many locules and trifoliolate or rarely 
unifoliolate leaves; (2) Feronia and Feroniella, with very hard- 
shelled fruits with five locules coalescing into a single cavity, 
and pinnate leaves; (3) Chaetospermum, with a leathery rinded 
8- to 10-celled fruit and trifoliolate leaves. 
Recently a new member of the Balsamo citrinae has come to 
light in the Malay Peninsula. It is apparently most closely 
related to Chaetospermum but differs widely from it as will be 
seen from the account given below. 
During the winter of 1917-18 Professor C. F. Baker sent to 
me at Washington a fine specimen of the fruit of Murray a 
caloxylon Ridl., 5 from a tree growing in the botanic gardens 
at Singapore. It was at once apparent that this fruit did not 
belong to a plant of the genus Murray a ( Chalcas ) but apper- 
tained instead to the group mentioned above. As I did not have 
a flowering specimen, I hesitated to publish on this plant because 
it had so many aberrant characters that it seemed possible the 
flower might show unexpected characters. 
Upon reaching Manila in July, 1918, I was agreeably sur- 
prised to find that Professor E. D. Merrill, acting director of 
the Bureau of Science, had secured from Mr. I. H. Burkill, 
director of the Singapore Botanic Gardens, a beautiful flowering 
specimen collected in March, 1918, and also fresh fruits from 
the same tree. One of these fruits had been kept in the refrig- 
erator and was still fresh enough to be studied. 
In the meantime Professor C. F. Baker, dean of the College 
of Agriculture of the University of the Philippines, had brought 
seeds from Singapore and planted them in the college nurseries 
at Los Banos, Laguna Province, Luzon. These seedlings enabled 
me to observe the germination characters. 
Thanks to all this material, as well as my notes on the type 
material of the species ( H . C. Robinson 55^8) which, through the 
courtesy of Mr. E. G. Baker, I was able to study in the British 
5 Ridley, H. N., New or rare Malayan plants, Series IV, Journ. Straits 
Branch Roy . As. Soc. 50 (1908) 111-114. 
