THE OAKS OF THE PHILIPPINES. 319 



the speeiincns referred to definite species below will later be found to be 

 really dilferent, vvlieu additional material is secured. I have below dis- 

 posed the specimens in flower, and those Math immature fruits, to the best 

 of my ability, but am not always sure that they are always correctly re- 

 ferred. Although a great number of specimens have been cited, the fol- 

 lowing paper by no means accounts for all in our herbarium, for I have 

 described no new species excepting those of which mature fruits were 

 available. . It is apparent that several fonns remain to be described at 

 a later date when more complete material is secured. 



Most of the species of Quercus found in the Philippines are endemic, 

 bilt four species, as here interpreted, being found outside of the Philip- 

 pines, two in Celebes, Quercus Uanosii and Q. ovalis, if the identification 

 of the Celebes material is correct, and two, Q. reflexa King and Q. 

 henncttii Miq., in Borneo, the latter extending to Bangka and Malacca. 



Nearly all our species of the genus are found in the hill or mountain 

 forests at medium and higher altitudes, but three species being known 

 from comparatively low altitiides, Q. caudaiifolia, occuring at least as low 

 as 20 m above vsea level in Mindanao, and Q. hcnnetiii and Q. soleriana, 

 being found as low as 100 m on Mount Mariveles, in Luzon. Some 

 species, like Quercus jordanae, are very abundant in the mossy forests like 

 those of Mount Data and Mount Tonglon, at altitudes as high as 3,250 

 m, but the great bulk of the species are found at altitudes of from 400 

 to 1,500 m. 



KEY TO THE PHILIPPINE GENERA AND SPECIES OF FAGAOE^. 



Involucre inclosing the nuts, often splitting irregularly, armed externally with 

 rather long spines, usually containing more than one nut I. Castanopsis 



Involucre inclosing the nut in few species only, mostly cup- or saucer-shaped, 

 covered with imbricate scales, or zonulate, rarely tuberculate, never contain- 

 ing more than one nut 2. Quercus 



1. CASTANOPSIS Spach. 



I. Castanopsis philippensis (Blanco) Vidal Eev. PI. Vase. Filip. (1886) 265. 

 (pMlippinensis) . 



Fagus philippensis Blanco Fl. Filip. ed. 2 (1845) 503, err. typ. philipensis. 



Castanopsis sumatrana F.-Vill. Nov. App. (1883) 210, fide Vidal, non A. DC. 



Castanopsis javanica Vidal Sinopsis Atlas (1883) t. 92, f. I, non A. DC. 



Luzon, Province of Rizal, Bosoboso, Bur. Sci. 2658 Ramos, May, 1907; For. 

 Bur. 2JJi8, 2812, 3100 Ahern's collector, November, 1904, March, May, 1905. Min- 

 DORO, Calausan, For. Bur. 85-17 Merritt, January, 1908. 



The specimens cited above agree with Vidal 6tlhis, in Herb. Kew, collected at 

 Angat, Province of Bulacan, Luzon, and also agree with Blanco's description. 

 Endemic. 



A second species, probably undescribed, occurs in the Philippines, enumerated 

 by Vidal 1. c, as Castanopsis sp., and previously erroneously identified by F.-Villar 

 J. c, as C. javanica A. DC, and by Vidal, Sinopsis Atlas 1. c, /. H, as C. sumatrana. 

 I have no specimens of it. 



