THE OAKS OF THK PHILIPPINES. 321 
§ Pasanta, 
1. Quercus dementis sp. nov. 
Arbor 10 ad 13 m alta^ infloresccntiis, subtus foliis, ramulisque plus 
minus ferrugineo-pul)escentibus; foliis oblongis vel elliptico-oblongis, rig- 
ide chartaceis vel subcoriaceis, 10 ad 18 cm longis^ basi acutis, apice 
breviter obtuseqiie acuminatis^ integris, nitidis, subtus sparse pubescen- 
tibus, reticulis laxis, distinetis; cupulis 2 ad 2.5 cm diametro, utrinque 
dense f errugineo-pubescentibus ; glandibus subcjdindraceis, apice subtrun- 
catis, 2 cm longis. 
A tree 10 to 13 m bigb, the branchlets and inflorescence densely fer- 
ruginous-pubescent. Branches slender, reddish-brown, ultimately glab- 
rous. Leaves alternate, oblong or elliptical-oblong, 10 to 18 cm long, 4 
to 7 cm wide, firmly chartaceous or subcoriaceous, the base acute, the apex 
rather abi'uptly and shortly acuminate, the acumen blunt, margins entire, 
slightly recurved, shining on both surfaces, the upper surface glabrous, 
or pubescent on the midrib and lateral nerves, the lower surface more or 
less pubescent on the. midrib and nerves, and with scattered hairs on the 
surface, in age nearly glabrous; lateral nerves 10 to 12 on each side of 
the midrib, strongly impressed on the upper surface, very prominent 
beneath, anastomosing and forming a somewhat arched submarginal nerve, 
the reticulations rather lax, very distinct; petioles stout, more or less 
pubescent, 5 mm long. Male inflorescence: spikes 8 to 13 cm long, 
fascicled in the upper axils or in depauperate panicles, densely ferrugin- 
ous-pubescent ; flowers sessile, solitary, the perianth 2 mm long, densely 
pubescent, 6-lobcd; stamens 10, the longer filaments 3 mm. Female in- 
florescence: spikes 12 to 20 cm long, in terminal panicles, when young 
densely pubescent, in age subglabrous ; flowers solitary, numerous, pubes- 
cent. Fruits maturing the second year, the involucres 1 cm high or less, 
2 to 2.5 cm in diameter, densely fermginous-pubescent on both surfaces, 
the scales on the outer surface \ery numerous, appressed, imbricate, acu- 
minate, about 2 mm long. Glans 2 cm long and 2 cm in diameter, 
deciduous-puberulent, subcylindrical, ihe sides parallel, the apex very 
abruptly rounded-su1)truncate, apiculate. 
Mindanao, Lake Lanao, Camp Keithley, Mrs. Clemens 906^ February, 1907, 
and four sheets without numbers from the saiHc locality, April, June, and Sep- 
tember, 1907. A closely allied form is represented by Clemens llSSj from the 
same locality, but the specimen has Immature fruits and its leaves have about 15 
pairs of lateral nerves. 
The species above described seems to be allied to Quercus lamponga Miq., of 
the Malayan region, but is apparently sufficiently distinct from that species, the 
scales of the involucre not arranged in lamellae. It is well characterized by its 
subcylindrical «,'liins that is as long as broad, and its rather laxly and strongly 
reticulate leaves. According to the collector the bark of this tree peels oil in thin 
papery flakes similar to that of many species of Bctula. 
