THE FLORA OF MOUNT IIALCON. 
291 
ARTHROPHVLLUM Blume. 
Arthrophyllum sp. 
In forests at 700 m. alt. (No. 5597), flowers immature, apparently representing ■ 
an undeseribed species. 
ARALIA Linn. 
Aralia glauca Merrill n. sp. 
Arbor ad 10 m. alta, ramis ramulis foliisque inermibus; foliis bipin- 
natis 40 ad 50 cm. longis, pi'nnis 5-jugatis 20 ad 30 cm. longis; foliolis 
4 ad 7-jugatis, obfongo-ovatis, aeuminatis 6 ad 11 cm. longis, snbtus 
pallidis ; paniculis terminalibus 50 cm. vel ultra longis et latis, ramis 
elongatis ad 40 cm. longis, ramulis racemose • dispositis, 4 ad 6 cm. 
longis; ovario 5-loculare. 
A spineless tree about 10 m. high, the branches thickened, the ultimate 
ones 1.5 to 2 cm. in diameter, lenticellate, striate when dry, glabrous 
or nearly so, the large bipinnate leaves crowded at the apices of the 
branches, the inflorescence of, several large spreading terminal panicles. 
Leaves about 50 cm. long, the pinnte 5- jugate, opposite, the rachis 
glabrous terete, enlarged at the nodes which are prominently jointed, the 
petiole 20 to 25 cm. long, glabrous; pinnse 20 to 30 cm. long, the lowest 
pair shorter; leaflets 4 to 7 -jugate, opposite, oblong-ovate to oblong- 
lanceolate, glabrous, sub coriaceous, dull, the lower surface glaucous, 6 to 
11 cm. long, 2 to 4 cm. wide, the base rounded or cordate, gradually 
narrowed above to the rather prominently acuminate apex, the margins 
distantly irregularly sinuate-crenate, the teeth frequently apiculate, 
nerves 5 to 6 on each side of the midrib, rather prominent beneath; 
petiolules 1 to 4 mm. long. Panicles at least 50 cm. long and about as 
wide, several from the apex of the same branch, the branches racemosely 
disposed, about 40 cm. long, the rachis thick, about 20 cm. long, slightly 
hirsute, branches slightly ferruginous-pubescent, the bran eh lets and 
pedicels rather densely so; branchlets racemosely disposed, slender, 4 to 
6 cm. long, numerous, each supplied with many scattered lanceolate 
acuminate bracts or bracteoles ‘2 to 3 mm. long the flowers umbellately 
disposed, usually 2 umbels towards the apex of each branchlet and fre- 
quently solitary flowers in the axils of the upper bracts below the umbels. 
Umbels 15 to 20-flowered, the pedicels 5 mm. long or less. Flowers 
(immature) white, petals 1.5 mm. long. Calyx 1.5 mm. long, the lobes 
5, broadly ovate, acute, 0.3 mm. long. Stamens 5 ; anthers 1 mm. long. 
Ovary 5-celled; styles 5, free, 1 mm. long. 
In forests at 700 m. alt. (No. 6177), locally rather abundant and recognizable 
by being entirely unarmed. 
The very spiny Aralia hypoleuca Presl is abundant on recent “slides” on Halcon 
at an altitude of about 1,800 m. It is widely distributed in the Philippines and 
has been reduced by Forbes and Hemsley to the very widely distributed Aralia 
spinosa Linn! 
