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nalibus numerosis projectis et sulcis alternatis 
vadosis, superficie sublucida et in sicca brunnea, 
parte supera Vs libera, in sectio transverse 
quadrato vel pentagono, apice lata et vadositer 
concavo-truncata, carpelis 6-9 plerumque 7 api- 
cibus truncatis vadositer concavisque eis cen- 
tralibus tessellatis, sinibus centralibus subnullis, 
stigmatibus 1.5-2 mm. longis oblique elliptici- 
bus et cum sinu basali centrali, carpela proxima 
breviore phalangis quisque focum est et stig- 
matibus alteris omnibus ad carpelam proximam 
singularem dirigitis, endocarpio paene subme- 
diali osseosi pallide brunneo marginibus 3-4 
mm. latis, seminibus 14 mm. longis, 3 mm. 
diametro anguste ellipsoideis, mesocarpio api- 
cali grandi l A parte phalangis repletenti et in- 
divisi multifibrosi et brunneo-medulloso mem- 
branoso, mesocarpio basali fibroso et carnoso. 
Tree 16 m. tall, 25 cm. in diameter at the 
widest part (8 m. up the trunk), with ample 
crown; the bark slightly muriculate; prop roots 
4-6 m. long, 10 cm. in diameter, spiny; leaves 
3.65 m. long, 15 cm. wide, ligulate, plane, the 
apex slender and long tapering, at 10 cm. below 
the apex only 10 mm. wide; the margins near 
the base with salient or ascending stout prickles 
2.5-3 mm. long, 4-9 mm. apart; near the middle 
the teeth 1.5-2 mm. long, 4-6 mm. apart, 
appressed ascending; near the apex the teeth 
0.5-1 mm. long, 1-3 mm. apart, appressed as- 
cending; the midrib below unarmed at base, at 
the middle with ascending prickles 0.5-1 mm. 
long, 8-19 mm. apart, but near the apex like 
those of the adjacent margins; fruiting heads 
terminal, single, ascending, ovoid, 42-51 cm. 
long, 25-29 cm. in diameter, weighing 14-24.36 
kilos; phalanges 160-212 in number, 10.5-12.6 
cm. long, 4-5.5 cm. wide, 3. 5-5. 5 cm. thick, 
oblance-oblong, yellow, the sides with numerous 
sharp, longitudinal ridges and alternating shal- 
low furrows, the surface sublucid, when dried 
brown, upper Vs part free, in cross-section 
quadrate or pentagonal, the broad apex shallow 
concave-truncate; carpels 6-9, mostly 7, their 
apices truncate and shallowly concave, the cen- 
tral ones tessellate, their sinuses nearly lacking; 
stigmas 1.5-2 mm. long, oblique, elliptic, with 
Fig. 2. Pandanus biakensis, holotype, in situ. 
a basal central cleft, the proximal carpel of each 
phalange the shorter and with the stigma facing 
distally, and all the other carpels oriented to 
and facing this focus carpel; endocarp slightly 
submedian, bony, pale brown, its margin 3-4 
mm. thick; seeds 14 mm. long, 3 mm. in diame- 
ter, narrowly ellipsoid; apical mesocarp one 
large undivided area occupying Vs of the phal- 
ange, traversed by numerous fibers and with 
many membranous, brown cross-partitions, en- 
closed by a marginal prolongation of the endo- 
carp; lower mesocarp fibrous and fleshy. 
NOM. VERN.: "andim” (Biak); "diem” (Ku- 
rudu). Informant: Thimotaeus Samber of Biak. 
HOLOTYPUS: Netherlands Nieuw Guinea, 
Biak I., 7 km. n. of Bosnek, in forest of bamboo, 
Cyathea, and Ervatamia, 60 m. alt., trees planted 
in forest edge, said to have been imported from 
Japen Is., 8 Dec. 1957, H. St. John 26,142 
(BISH). 
Fig. 1. Pandanus biakensis , from the holotype. a, Leaf base underside, X V V leaf base margin, X 4; 
c, leaf middle underside, X 1; ^ leaf tip underside, 'X. 1; e, phalange, lateral view, X 1; 1 phalange, median 
longitudinal section, X 1; g, phalange apex, X 2. 
