THE OAKS OF THE PHILUTIXES. 319 
the specimens refei'red to definite species below will later be found to be 
really different, when additional material is secured. I have below dis- 
posed the specimens in flower, and those with immature fruits, to thebest' 
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 her})arium, for I have 
described no new species excepting those of which mature fruits were 
available. It is apparent .that several forms remain to be described at 
a later date when more complete material is secured. 
Most of the species of Qnevcus found in the Philippines are endemic, 
but four species, as here interpreted, being found outside of the Philip- 
pines, two in Celebes, Qaercus Uanosii and Q. ovalis, if the identification 
of the Celebes material is correct, and two, Q. reflexa King, and Q. 
bennettii Miq., in Borneo, the latter extending to Bangka and "Malacca. 
Xearly 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 altitudes, Q. caudatlfolia, occuring at least as low 
as 20 m above sea level in Mindanao, and Q. henndili and Q. soleriana, 
being found as low as 100 m on Mount Mariveles, in Luzon. Some 
species, like Qucrcus jordanae, are very abundant in the mossy forests like 
those of ]\rount Data and Mount Tonglon, at altitudes as high as 2,250 
m, but the great bulk of the species are found at altitudes of from 400 
to 1,500 m. 
KEY TO THE PTIILTPriNE GENEVA AND SPECIES OF FAGACE.E. 
Involucre inclosing tlie nuts, often splittiii;^ ivrt'gnlarly, armed cxtt^mally with 
rather long spines, usually containing mure than one nut 1. Casianopsis 
Involucre inclosing the nut in few species only, mostly cup- or saucor-sliaped. 
covered Avith imbricate scales, or zonulate, rarely tuberculate, never contain- 
ing more than one nut 2. Quercus 
1. CASTANOPSIS Spach. 
1. Castanopsis philippensis (Blanco) Vidal Rev. PI. Vase. Filip. (1880) 265. 
(phiJippinensifi) . 
Fagiis phiUppetisis Blanco Fl. Filip. ed. 2 (1845) 503, err. typ. philipoi.^is. 
Castanopsis sumatrana F.-Vill, Nov. App. (1SS3) 210, fide Vidal, non A. DC. 
Castanopsis javanica Vidal Sinopsis Atlas (1883) t. 'J2y /. /, non A. DC. 
Luzon, Province of Rizal, Busohoso, Bur. 8ci. 2658 Ramos, ^hxy, 1007; For. 
Bur. 2JA8, 2872, 3100 Ahern's collector, November, 1904, Alarch, May, 1905. Mi.n- 
noRO, Calausan, For. Bur. 8.5-47 Merritt, January, 1908. 
The specimens cited above agree with Vidal OJlbis, 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 Cmtanopsis sp., and previously erroneously identified by F.-Villar 
). c., as C. javanica A. DC, and by Vidal, Sinopsis Atlas I. c, /. H, as C, sumatrana. 
I have no specimens of it. 
