x, c, 2 Merrill: Studies on Philippine Rubiaceae, II 143 
HYDNOPHYTUM MiNDORENSE sp. nov. 
Frutex epiphyticus, glaber, circiter 1.5 m altus, ramis ramu- 
lisque teretibus; foliis coriaceis, ellipticis ad ovato-ellipticis, 
usque ad 8 cm longis, apice late rotundatis, basi acutis, in sic- 
citate nitidis, purpureo-brunneis, nervis utrinque 4 vel 5; flori- 
bus, axillaribus, fasciculatis, 5.5 mm longis. 
An epiphytic shrub about 1.5 m high, the swollen base about 
40 cm in diameter. Branches stout, terete, grayish, and even 
the branchlets woody, the latter about 3 cm in diameter, often 
somewhat compressed, their internodes 2.5 to 6 cm long. Leaves 
elliptic to ovate-elliptic, coriaceous, shining, 5 to 8 cm long, 3 
to 4.5 cm wide, the apex broadly rounded, the base acute, when 
dry somewhat purplish-brown, the lower surface paler than 
upper and more tinged with purple; lateral nerves 4 or 5 on 
each side of the midrib, slender, rather distinct, anastomosing, 
the reticulations obsolete; petioles very stout, 2.5 to 4 mm long. 
Flowers white, axillary, fascicled, sessile, about 5.5 mm long. 
Calyx cup-shaped, truncate, about 1.5 mm long and wide. Co- 
rolla-tube 3 mm long, slender, the lobes 4, oblong, obtuse, 2.5 
mm long, the throat villous. Anthers 1 mm long. Style 3.5 
mm long, the arms spreading, 0.5 mm long. Fruit ovoid, red, 
fleshy, about 7 mm long. 
Mindoro, Alag River, Merrill 6182, November, 1906, on trees along the 
river at an altitude of about 100 meters, previously referred to Hydno- 
phytum formicarium Jack. 
Apparently very closely allied to Hydnophytum formicarium Jack, but 
with elongated branches, somewhat smaller flowers, and somewhat differ- 
ently shaped leaves which are distinctly tinged with purple in drying. 
HYDNOPHYTUM MEMBRANACEUM sp. nov. 
Frutex epiphyticus, glaber, circiter 1 m altus ; foliis membran- 
aceis, in siccitate nitidis, olivaceis vel subpurpureo-olivaceis, 
oblongo-obovatis ad late elliptico-ovatis, usque ad 9 cm longis, 
obtusis vel rotundatis, basi angustatis, acutis, nervis utrinque 
5 ad 7, tenuibus; floribus axillaribus, paucis, circiter 2 mm 
longis. 
An epiphytic glabrous shrub about 1 m high, the base about 
15 cm in diameter. Branches apparently terete, smooth, more 
or less compressed when dry, shining, pale grayish-brown, when 
fresh apparently somewhat fleshy, the ultimate branchlets slen- 
der, about 2 mm thick, their internodes up to 3.5 cm long. 
Leaves membranaceous, when dry puncticulate but not wrinkled, 
shining, olivaceous, often tinged with purple, oblong-obovate to 
broadly elliptic-ovate, 5 to 9 cm long, 2 to 6 cm wide, the apex 
broadly rounded or obtuse, narrowed below to the acute base; 
