17, 5 Merrill: Studies on Philippine Rubiaceae, IV 429 
void, about 2.5 mm long, their pedicels 3 mm long or less, the 
persistent calyx-teeth oblong-lanceolate, acute or somewhat acu- 
minate, about 2 mm long. 
CATANDUANES, Mount Mariguidon, Bur. Sci. 30443 Ramos, 
November 17, 1917, on forested slopes. 
This species is most closely allied to Hedyotis caudata Merr., 
from which it is readily distinguished by its larger leaves, which 
are not caudate-acuminate, and its entirely glabrous stipules. 
HEDYOTIS DIFFUSISSIMA sp. nov. 
Suffruticosa, erecta, glabra, 1 ad 1.5 m alta, ramis circiter 6 
mm diametro, acute 4-angulatis vel anguste 4-alatis; foliis mem- 
branaceis, in siccitate obscure olivaceis, nitidis, oblongis ad 
oblongo-ellipticis, usque ad 16 cm longis, utrinque subaequaliter 
angustatis et acuminatis, nervis utrinque circiter 6, adscenden- 
tibus; inflorescentiis axillaribus, longissime pedunculatis, dif- 
fusissimis, usque ad 40 cm longis, laxis, floribus circiter 6 mm 
longis, tenuiter pedicellatis. 
An erect, suffrutescent, slightly branched plant, 1 to 1.5 m 
high, glabrous throughout except the inside of the petals. 
Branches sharply 4-angled or narrowly 4-winged, dark-olivaceous 
when dry, smooth. Leaves membranaceous or at most charta- 
ceous, in general oblong to oblong-elliptic, 11 to 16 cm long, 3 
to 5.5 em wide, dark-olivaceous and shining when dry, smooth, 
subequally narrowed to the acuminate base and apex, the apical 
acumen slender, acute; lateral nerves about 6 on each side of 
the midrib, prominent on the lower surface, curved, ascending; 
petioles about 2 cm long; stipules lanceolate to oblong-lanceolate, 
acuminate, margins irregularly lacerate, about 1.5 cm long. 
Panicles axillary, solitary, long-peduncled, lax, very diffuse, up 
to 40 cm in length, the primary branches few, the lower ones 
up to 12 cm in length, the peduncles up to 20 cm long and more 
or less 4-angled. Flowers comparatively few, white, 4-merous, 
about 6 mm long, the slender pedicels up to 1 cm in length, the 
bracteoles lanceolate, acuminate, about 2 mm long. Calyx-tube 
ovoid, somewhat 4-angled, 1.5 mm long, the lobes oblong-ovate, 
somewhat triangular, acute, keeled, 1.5 mm long. Corolla-tube 
2 mm long, the lobes oblong-ovate, acute, 2.5 mm long, densely 
pubescent inside. Capsules ovoid, black when dry, 4 to 5 mm 
long. 
LUZON, Apayao Subprovince, Mount Sulu, Bur. Sci. 28387 
Fénix, May 22, 1917, on rocky forested slopes, altitude about 
1,000 meters. 
