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304 MERRILL AND MERRITT. 
region, but which have as’ yet have no known representatives in other 
parts of the Philippines. The number of species present on Mount 
Pulog that are confined to the Benguet-Lepanto region, so far as their 
Philippine distribution is concerned, is 251, or nearly 50 per cent of the 
total number considered in the following enumeration. 
The flora of Mount Mariveles* in the Province of Bataan, Luzon, a 
much lower peak than Mount Pulog, and situated at about 200 kilometers 
south of the latter mountain, and of Mount Halcon,* Mindoro, ranking 
among the higher peaks in the Philippines, and situated at approximately 
350 kilometers south of Mount Pulog, and on another island, have been 
somewhat investigated, and data regarding the vegetation of the two have 
been compiled, so that a rough comparison between the floras of the 
three peaks is possible. In making this comparison, however, it should 
be borne in mind that in the case of both Mount Mariveles and Mount 
Halcon many species from the lower slopes are included, and in the case 
of the former, all the plants known from a certain area extending from 
sea level to the summit of the highest peak are considered; in the case 
of Mount Pulog, situated as it is in an elevated region, many of the 
widely distributed species characteristic of the low country are naturally 
eliminated, and nothing can be considered below an altitude of about 
1,000 m. 
On Mount Halcon, considering only the phanerogams and vascular 
cryptogams, representatives of 28 families, 158 genera, and 530 species 
were found, that have not been seen on Mount Pulog, and vice versa, 
27% families, 176 genera, and about 380 species are found on Mount Pulog 
that have not been found on Mount Halcon. Only 67 species of 58 
genera are common to both Mount Haleon and Mount Pulog, and a high 
percentage of these are widely distributed on most of the higher mountains 
of the Archipelago, and many of them extend to other mountains in the 
Malayan region outside of the Philippines. 
In the case of Mount Mariveles, the comparison results approximately 
the same; of the 587 genera and 1,117 species recorded from the Lamao 
Forest Reserve, only about 80 species, representing nearly that number of 
genera, have also been found on Mount Pulog. 
The evidence at hand seems to show that the flora of the mountains 
in the central and southern Philippines is essentially Malayan, while that 
of the mountains in the Benguet-Lepanto region is very decidedly Asiatic, 
containing a great number of Himalayan types, and presenting the limits 
of the southeastern extension of the Himalayan flora. 
The dominant and characteristic species of the Benguet-Lepanto region 
is the pine, Pinus insularis Endl., a species very closely allied to and 
’This Journal 1 (1906) Suppl. 1-141. 
‘LT. ec. 2 (1907) Botany 251-309. 
