42 The Philippine Journal of Science ms 
characters, and is equally distinct from the scandent Begonia megacarpa 
Merr. 
CORNACEAE 
M ASTI XI A Blume 
MAST I XI A TETRAPETALA sp. nov. § Tetramastixia. 
Arbor parva, inflorescentiis exceptis glabra; foliis numerosis, 
confertis-, alternis, oblongis ad oblanceolatis, coriaceis, usque ad 
8 cm longis, pallide olivaceis, nitidis, apice obtusis ad leviter 
obtuseque acuminatis, basi cuneatis, nervis utrinque 6 ad 7, 
distinctis; paniculis terminalibus, circiter 2 cm longis, leviter 
pubescentibus ; floribus 4-meris, circiter 6 mm diametro, petalis 
late ovatis, subacutis, glabris, 3 mm longis, calycis lobis latis, 
subacutis, glabris, circiter 1 mm longis. 
A small tree 3 to 4 m high fide Ramos, glabrous except the very 
youngest growing parts and the inflorescences. Branches rather 
stout, brownish, rugose, glabrous, terete, the very young branch- 
lets and young petioles sparingly appressed cinereous-pubescent. 
Leaves alternate, crowded, sometimes subopposite, coriaceous, 
oblong to oblanceolate, 5 ad 8 cm long, 2 to 3 cm wide, pale- 
olivaceous when dry, slightly shining, glabrous, the apex obtuse 
to shortly and obtusely acuminate, base cuneate, margins often 
revolute ; lateral nerves 6 or 7 on each side of the midrib, distinct, 
the reticulations obscure; petioles 8 to 14 mm long. Panicles 
terminal, sparingly appressed-pubescent, about 2 cm long, 
branched from the base. Flowers 4-merous, rather numerous, 
greenish-yellow, about 6 mm in diameter. Calyx-tube stout, 
glabrous or very slightly pubescent, about 2 mm long and thick, 
the limb somewhat spreading, the teeth 4, broadly triangular, 
acute, about 1 mm long and wide. Petals suborbicular-ovate, 
subacute, 3 mm long and wide. Filaments 2.3 mm long; anthers 
broadly ovoid. Ovary projecting slightly above the calyx-tube, 
the style stout, angled, about 1 mm long. Bracteoles triangular- 
ovate, acute, 1 mm long, pubescent. 
Luzon, Tayabas Province, Mount Binuang, Bur. Sci. 28575 (type), 28628 
Ramos & Edano, May, 1917, in forests near the summit of the mountain, 
altitude apparently about 1,000 meters. 
This species is readily distinguished among the few Philippine forms 
by its relatively narrow, crowded, alternate, leaves and its 4-merous flowers. 
It does not appear to be very closely allied to any previously described 
form. Bur. Sci. 29088 Ramos & Edano, from the same locality, may be 
referable to this species, but it has subopposite larger leaves and much 
larger inflorescences; the flowers are very immature. Mastixia premnoides 
(Elm.) Hallier f. ( Vitex premnoides Elm.), which has 4-merous flowers, 
is entirely different in its vegetative and floral characters. 
