272 The Philippine Journal of Science ms 
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 ; foliis 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- 
eentibus, 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 
