60 
MARTELLI. 
1902, from the eight species enumerated in tire works of Blanco and 
Vidal, those of the former very doubtful and imperfectly known, the 
number of species of Pandanus known to occur in the Philippines has 
been increased to twenty-three with several varieties and forms, and three 
doubtful species. As, in so a short time, the known number of these 
plants has been so appreciably multiplied, I think it probable that, even 
now, we know not more than one-half of the species of Pandanus actually 
growing in the Archipelago. 
So far as 1 can judge, giving due consideration to the general geo- 
graphical distribution of the plants of the Philippines, it seems to me 
possible that several of the species of Pandanus which now appear to be 
endemic in the Philippine Archipelago, may not really be so, but are likely 
to grow also in Borneo, Celebes, or in other neighboring countries, 
which at the present time are insufficiently explored botanicallv. Tlie 
numerous specimens of Pandanus collected by recent botanists have 
afforded the means of identifying most of the species too briefly and 
obscurely described by Blanco, which otherwise would have remained 
unrecognizable. We are indebted especially to Mr. Merrill and Mr. 
Elmer, for having, in their explorations, given especial attention to 
the rediscovery of Blanco’s species. I have also been able to identify, 
with the help of the recently collected material, a few specimens of 
Philippine Pandanus, from older collections which were preserved in 
various European herbaria without any reference to their origin or 
collectors. 
I wish to acknowledge my especial indebtedness to Mr. E. D. Merrill, 
who has rendered possible this revision of Philippine Pandanus, by the 
generous loan of the entire collection of this group of plants contained 
in the herbarium of the Bureau. of Science, and also for having presented 
me with a complete set of his duplicate types. I am also much obliged 
to Mr. A. I). E. Elmer, who has been so good as to send me his specimens 
and to communicate the results of his researches. The specimens cited 
in this paper, unless otherwise stated, are to be found in the herbarium 
of the Bureau of Science, and in my private herbarium. 
§ KEURA. 
(1) Pandanus Linnaei Gaud. Voy. Bonite (1844) t. 12, f. 1-S. 
Arbuseula 2-4 m alta, basi non vel vix radicans (Merrill). Folia 
1 .6-1 .8 m longa, 7 cm lata, basi non dilatata, apicem versus gradatim 
longe angusteque acuminato-attenuata, supra sublevis et nitida, subtus 
glauca, crebre et minutissime longitudinaliter nervosa, marginibus (ima 
basi excepta) crebre dentato-serratis, dentibus subulatis, longiusculis, 
erecto-patentibus ; costa media prominenti acuta spiriis parvis, subulatis, 
inferior! bus retroflexis munita. Syncarpium solitarium, magnum, glo- 
boso-oblongum, viride, pendulum, longe et valide pedunculat-um. 
Phalanges numerosae (55 e Merrill), 7.5 cm longae, obconicae, basi 
