THE OAKS OF THE PHILirPINES. 321 



§ Pasanta. 



I. Quercus dementis sp. iiov. 



Arbor 10 ad 13 m alta, infloresceiitiis, subtus foliis, ramulisque plus 

 minus ferrufi'inco-])ubeseentibus ; foliis oblongis vel elliptieo-ol)longis, rig- 

 ido cliartaccis vel subcoriaccis, 10 ad LS ciu longis, l)asi aciitis, apice 

 l)reviter obtuseque aeuniinatis, iiitogris, nitidis, subtus sparse pubescen- 

 tibus, rctioulis laxis, distinctis; cupulis 2 ad 2.5 cm diametro, utrinque 

 dense ferrugineo-pubescentibus ; glandibus sulx-ylindraeeis, apice subtrun- 

 catis, 2 cm longis. 



A tree 10 to l;] m bigb, tlie brancblets and inilorescence densely fer- 

 ruginous-pubescent. Branches slender, reddisli-l)rown, 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 abruptly 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-lobed; 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 ferruginous-pubescent on both surfaces, 

 the scales on the outer surface very numerous, appressed, imbricate, acu- 

 minate, about 2 mm long. Glans 2 cm long and 2 cm in diameter, 

 deciduous-puberulent, sulx-ylindrical, the sides parallel, the apex very 

 abruptly rounded-subtruncate, apiculate. 



Mindanao, Lake Lanao, Camp Keitliley, Mrs. Clemens 906, February, 1907, 

 and four sheets without numbers from the same locality, April, June, and Sep- 

 tember, 1907. A closely allied form is represented by Clemens 1138, from the 

 same locality, but the si)ecimen has immature fruits and its leaves have about 15 

 pairs of lateral nerves. 



The species above described seems to be allied to Quercus laiiiponga Miq., of 

 tlie Malayan region, but is apparently sufficiently distinct from tliat species, the 

 scales of the involucre not arranged in lamelliE. It is well characterized by its 

 sidicylindrical glans that is as long as broad, and its ratiier laxly and strongly 

 reticulate leaves. According to tlie collector the bark of tliis tree ])eols oft' in thin 

 papery flakes similar to that of many species of Bctulct. 



