23, i Merrill: Distribution of Dipterocarpaceae H 



carp forests have been especially considered by Whitford, 10 by 

 Brown and Matthews, 11 and by Brown. 12 



Whitford, 13 in discussing the dipterocarp forests on the lower 

 slopes of Mount Mariveles in Bataan Province, Luzon, enumer- 

 ated the trees in four plots, varying in size from 300 to 750 

 square meters, between altitudes of 260 and 410 meters. He 

 found in these plots three hundred eighty-eight individual trees, 

 representing eighty-eight species, of which six species were 

 representatives of the Dipterocarpaceae. Three species, namely, 

 Dipterocarpus grandiflorus Blanco, Shorea polysperma Merr., 

 and Parashorea contorta Merr. and Rolfe, comprised 31.6 per 

 cent of all the trees in the plots mentioned, and further, with 

 the exception of one species of Calophyllum, one species of San- 

 tiria, one of Eugenia, and a few others, these trees made up 

 nearly the whole of the upper-story vegetation. The other 

 dipterocarps in the plots were Anisoptera thurifera Blume, 

 Hopea acuminata Merr., and Dipterocarpus vernicifluus Blanco. 

 Brown 14 enumerated the individual trees growing on plots 50 

 meters square on the lower slopes of Mount Maquiling, Laguna 

 Province, Luzon. In one plot at 450 meters altitude in a virgin 

 dipterocarp forest he found three hundred fifty-three individual 

 trees, representing ninety-two species, of which three species 

 and twenty-nine individuals were Dipterocarpaceae. In a culled 

 dipterocarp forest at an altitude of 200 meters, of the same 

 area as the one discussed above, he found a total of eight hundred 

 eighty-seven individual trees representing one hundred twenty- 

 nine species, the Dipterocarpaceae being represented by three 

 species and eighty-one individuals. Even when the individual 

 dipterocarps are few in number they dominate the forest by 

 their great size (see Plates 5 and 6). 



After this preliminary examination of the geographic distri- 

 bution of the dipterocarps, a brief discussion of the paleobo- 

 tanical data available, the peculiar biological characters of the 

 family, and a general description of the dipterocarp forests in 



10 Whitford, H. N., The vegetation of the Lamao forest reserve, Philip. 

 Journ. Sci. 1 (1906) 373-431, 637-682, t. 1-45. 



"Brown, W. H., and Matthews, D. M., Philippine dipterocarp forests, 

 Philip. Journ. Sci. § A 9 (1914) 413-561, t. 1-18. 



12 Brown, W. H., The Vegetation of Philippic 

 between the environment and physical types a 

 Sci. Publ. 13 (1919) 1-434, t. 1-41, pp. 27-75. 



1S Op. cit. 640. 



"Op. cit. 440. 



