272 T^^ Philippine Journal of Science isis 



to 2 cm long, 3 to 5 mm wide, somewhat falcate, acuminate, 

 the base very inequilateral, one side with a rounded auricle, the 

 other acute, the margins with 2 or 3 very conspicuous teeth on 

 each side in the upper one-half, entire below, both surfaces min- 

 utely puncticulate, the lower paler than the upper and appressed- 

 hirsute with short hairs on the midrib beneath; lateral nerves 

 4 or 5 on each side of the midrib, distinct on the lower surface, 

 anastomosing, the reticulations rather lax; stipules lanceolate, 

 falcate, acuminate, often irregularly cleft near the apex, mem- 

 branaceous, 4 to 8 mm long. Receptacles all axillary, solitary, 

 sessile, mostly pistillate, occasionally a staminate one on the same 

 plant with the pistillate ones. Outer bracts very broadly obo- 

 vate, about 4 mm wide and long, much thicker than the inner 

 ones, brown, truncate, slightly corniculate, glabrous; the next 

 inner ones thinner, obovate, prominently retuse; the innermost 

 ones linear-lanceolate, ciliate. Staminate perianth segments 4, 

 2 mm long, two slightly corniculate; anthers 4. Pistillate seg- 

 ments 4, 0.5 mm long, oblong, obtuse. Achene 0.8 mm long. 



Catanduanes, Santo Domingo River, on stones along small streams in 

 forests at low altitudes, Bur. Sci. 30555 Ramos, December 5, 1917. 



This is perhaps as near Elatostema gracilifolium Merr. as any other 

 species, but is radically different from it in habit; its shorter, fewer- 

 toothed leaves which have no cystoliths; and in the details of its in- 

 florescences, 



FAGACEAE 



QUERCUS Linnaeus 

 QUERCUS RIZALENSIS sp. nov. § Cyclobalanus. 



Arbor parva, cupulis exceptis glabra, ramulis atro-brunneis 

 vel nigrescentibus ; f oliis coriaceis, integris, ellipticis ad elliptico- 

 ovatis, usque ad 6 cm longis, utrinque acuminatis, subtus pallidis 

 vel glaucescentibus, nervis utrinque circiter 6, tenuibus, distinc- 

 tis; fructibus paucis, in spicis brevibus dispositis; cupulis 

 circiter 1.3 cm diametro, cinereo-puberulis, lamellis 5 ad 7, denti- 

 culatis; glans conico-ovoideis, glabris vel junioribus leviter pubes- 

 centibus, circiter 1.4 cm longis et latis. 



A small tree, glabrous except the cups (inflorescences not 

 seen), the branches terete, dark-colored, the branchlets dark 

 blackish-brown, glabrous. Leaves numerous, elliptic to elliptic- 

 ovate, coriaceous, 4.5 to 6 cm long, 2 to 3 cm wide, subequally 

 narrowed to the acuminate base and to the acuminate apex, the 

 apical acumen narrow, hardly caudate, and less than 1 cm long, 

 the upper surface smooth, pale to brownish-olivaceous, the lower 

 pale or somewhat glaucous; lateral nerves about 6 on each side 

 of the midrib, slender, distinct, very obscurely anastomosing 



