17, 5 Merrill: Studies on Philippine Rubiaceae, IV 437 
bracts linear-lanceolate, acuminate, about 7 mm long. Flowers 
yellow, 3.5 to 4 cm long. Calyx-tube very densely villous, the 
lobes linear-lanceolate, persistent, villous, acuminate, 1 to 1.5 cm 
long, less than 2 mm wide. Corolla ferruginous-villous, some- 
what expanded upward, the lobes ovate, somewhat acuminate, 
5 to 6 mm long; foliaceous sepals long-stipitate, membrana- 
ceous, white, somewhat pubescent, the limb ovate to elliptic- 
ovate, 4 to 6 cm long, acuminate, the nerves and reticulations 
distinct. Fruit (immature) somewhat obovoid, sparingly pu- 
bescent, 1.5 cm long. 
Luzon, Ilocos Norte Province, Mount Nagapatan, Bur. Sci. 
33133 Ramos, August 8, 1918, on dry slopes, altitude about 700 
meters. 
Among those species with slender, elongated, persistent sepals 
this species is apparently most closely allied to Mussaenda phil- 
ippinensis Merr., but differs radically from that in its indumen- 
tum and in its differently shaped, smaller, more-numerously 
nerved leaves. 
OPHIORRHIZA Linnaeus 
OPHiORRHIZA MACGREGOR1I sp. nov. 
Herba erecta, simplex vel parce ramosa, 5 ad 10 cm alta, ramis 
et foliis subtus et inflorescentiis dense puberulis ; foliis ovatis ad 
ovato-ellipticis, usque ad 6 cm longis, membranaceis ad char- 
taceis, obtusis vel acutis, basi obtusis ad rotundatis, nervis utrin- 
que 6 vel 7, tenuibus, distinctis; cymis breviter pedunculatis, 
densis, paucifloris, circiter 1 cm diametro; floribus circiter 5 
mm longis, calycibus puberulis, corolla glabra; capsulis circiter 
7.5 mm latis, truncatis vel subtruncatis, obscure puberulis. 
An erect, simple or sparingly branched herb, 5 to 10 cm high, 
the stems, branches, and petioles rather densely subferruginous- 
puberulent, the indumentum usually pale on the midrib and 
nerves. Leaves ovate to ovate-elliptic, 2.5 to 6 cm long, 1.5 to 3 
cm wide, membranaceous to chartaceous, obtuse or acute, base 
rounded to obtuse, entire, the upper surface cinereous to oliva- 
ceous, very minutely and obscurely subpapillate-puberulent, the 
lower surface pale, densely puberulent on the midrib and lateral 
nerves ; nerves 6 or 7 on each side of the midrib, slender, distinct ; 
petioles about 5 mm long. Cymes about 1 cm in diameter or 
less, rather dense, puberulent, rather few-flowered, their pedun- 
cles less than 1 cm long. Flowers white, about 5 mm long. 
Calyx subglobose, 1.3 mm long, the teeth 5, oblong, 0.2 mm long. 
Corolla-tube glabrous, 3 mm long, the lobes oblong, obtuse, 1 
mm long. Capsule compressed, 7 to 8 mm wide, about 3 mm 
