PHILIPPINE PALMS, I. 
229 
almost grouped at the summit of a rather short, undivided, rather 
robust, rusty-furfuraceous peduncular portion, this is smooth above 
the insertion of the first spathe and densely spiculiferous below; the 
branches are all of about the same length, 25-30 cm. long and 8 mm. 
thick throughout, very closely and regularly hollowed by 4—5 vertical 
lines of orbicular, shallowly cupular, scrobiculi, which have below them 
a rather conspicuous leaf-like, broadly triangular, acute, deflexed bract. 
Fruit, when not quite mature, globose, 12 mm. in diameter, with a dull 
and finely granulate surface and with the scar left by the stigmas 
almost apical, orbicular, 2 mm. in diameter. 
In a ravine in forests about 30 m. above the sea between Pagbilao and Atimo- 
nan. Province of Tayabas, Luzon, No. 4010, Elmer D. Merrill, March, 1905. 
This differs from the few other species of the genus in its very slender trunk, 
in its spadix with few tufted, comparatively short and thick branches, which are 
all of about the same length and separate from the main axis at almost the same 
level. The fruits I have seen are still very young, but certainly they are larger 
than those of O. filamentosa, and considerably smaller than those of O. horrida. 
ARENGA Labill. 
Arenga Ambong Becc. n. sp. WalUchia oblongifolia (non Griff.) Bece. in 
Webbia (1905) p. 48. 
Caudex crassus et brevis, 30 cm. diam. (Copeland.) Folia am- 
plissima, segmentis numerosis, intermediis circiter 70 cm. longis ambitu 
elongato-lanceolatis, in utroque margine sinibus 5-6, saepius oppositis, 
profunde excavatis, in sinibus 6-7 cm. latis, in partibus latioribus usque 
ad 8-9 cm., basi longe euneatis, margine inferiore at basin auricula 
brevi rotundata praedito. Spadices simpliciter ramosi, ramis (dum 
flores c? adstant) 6-7 mm. spissis, fruetiferis valde auctis, teretibus, 
glabris, digiti minoris crassitie. Flores 6 in alabastro bene evoluto ovati, 
distincte abrupteque apiculati, 15 mm. longi; staminibus circiter 100. 
Fructus leviter depresso-globosus 3 cm. diam. 
Stem short and thick (non soboliferous?). Leaves very large; the 
pinniferous part, according to Copeland, is 3 m. and the petiole alone 
1-2 m. in length ; the rachis in the terminal part is very slender, and in 
the intermediate portion about 2 cm. thick, not very regularly trigonous 
in cross section and with the upper salient angle not very sharp ; the 
leaflets are numerous, very firmly papyraceous, those attached to a 
rachis of 2 cm. in thickness (probably the intermediate ones) are .70 
cm. long, with 5-6 very large superposed indentations on both margins ; 
the indentations of one side, generally, almost exactly opposite to those 
of the other side; an entire leaflet, therefore, has 5-6 places where they 
are narrower (6-7 cm. in width) than elsewhere (8-9 cm.) and appear 
as formed by several superposed reverted truncated- cones ; on the whole 
the leaflets are elongate-lanceolate in outline, slightly and rather gradually 
narrowing upwards into a rather broad and not very acute point; the 
basal part is rather narrowly, long and somewhat asymmetrical cuncate. 
