ENUMERATION OF PHILIPPINE LEGUMINOSAE. 
5 
grandiflora (prehistoric), Arachis hypogcea* Desmodium scorpiurus* D. 
procumbens* Lourea vespertilionis , Inocarpus edulis (prehistoric), Pi- 
sum sativum , Gentrosema plumieri,* Mucuna deeringiana , Canavalia 
gladiata* Cajanus indicus, Phaseolus lunatus,* P- adenanthus * P. 
semierectusj,* P. radiatus, Vigna sinensis , Doliclios lablab, Pachyrrhizus 
erosus* and Psophocarpus tetragonolobus. Of these apparently intro- 
duced species, those marked with an asterisk are undoubtedly of American 
origin. It is interesting to note that of these 26 species which have, for 
most part, at least, originated in tropical America, the following have 
not as yet been reported from any other part of the Orient, although all, 
with the exception of the first, are very common and widely distributed 
in the Philippines: Schranlcia quadri/valvis , Prosopis vidaliana, Parosela 
glandulosa, Gliricidia sepium, and Desmodium scorpiurus. 
It is possible that other species than those listed above, now cosmo- 
politan in the tropics, have originated in tropical America, and it is also 
very probable that still others of these cosmopolitan species now con- 
sidered as indigenous in the Philippines, have been introduced within 
historic times from other parts of Malaya or from Asia. This is es- 
pecially likely of the constituents of the low country flora in the vicinity 
of towns, for in dealing with the flora of the settled areas it is frequently 
difficult to determine whether or not an individual species is really native 
or introduced. 
One reason for considering that many of the plants found about towns 
and in cultivated areas in the Philippines are not really natives of the 
Archipelago, is found in the results obtained in the botanical exploration' 
of Polillo, an island having an area of about 300 square miles, off the 
east coast of Luzon. Botanical work was carried on here, extending 
over a period of about four months, by Dr. C. B. Eobinson in August, 
and Mr. E. C. McGregor from September to November, 1909. From 
a botanical standpoint the island is more interesting because of the 
species it lacks, rather than from those actually found there. Most of 
the species collected are of wide distribution in the Philippines and in 
the Indo-Malayan region generally, while novelties are comparatively 
rare. A striking character of the flora of the island, as a whole, is the 
lack of very numerous species, characteristic of the low country through- 
out the Philippines, weeds of cultivation, etc. Conditions are not lack- 
ing for the growth of these plants, for Polillo supports a population of 
about 3,000 inhabitants, and considerable areas are in cultivation and 
lying fallow. In Legummosae alone, the following results were obtained : 
Total number of species collected or observed 27 ; of these but 2 are 
endemic in the Philippines, 21 are of wide Indo-Malayan distribution, 
including 8 strand plants, and only 5 are considered to be of American 
origin. The common leguminous weeds and various other plants, char- 
acteristic of waste lands of the low country, and for most part cosmo- 
politan in the tropics, are conspicuous by their absence. It has been 
