Revision of the Genus Pandanus Stickman, Part 30 
The New Section Marginata from Papua 
Harold St. John 1 
Papua and its offshore islands are rich in 
species of Pandanus, many of which have been 
made known through the collections of L. J. 
Brass. The following is one of these, here 
described as a new species. It is in the affinity of 
the section Microstigma , but because of signifi- 
cant difference in the stigma, it is published 
below as the basis of a new section. 
Section Marginata, sect. nov. 
(subgen. Lop ho stigma) 
diagnosis: Drupis 1-carpelatis, stigmatibus termi- 
nalibus elevatis horizontalibus hippocrepiformibus, 
sinu stigmatis late marginatis, syncarpio solitario sub- 
cylindrico, plantis masculis incognitis. 
Drupe 1 -celled; stigma terminal, elevated, 
horizontal, horseshoe-shaped owing to the broad, 
hard stylar band of tissue on either side of the 
stigmatic sinus; syncarp solitary, subcylindric ; 
staminate plants unknown. 
holotypus: Pandanus marginatus St. John. 
To insert this in the "Key to the Sections” 
published in Part 1 of this series (Pacific Sci. 
14(3) :225), for the first C read: 
C. Stigma flush, papillose, 
y. Stigmatic sinus a mere crease; stamens um- 
bellate at apex of column . . . Microstigma 
y. Stigmatic sinus with broad stylar margin 
on either side, forming a horsehoe-shaped 
stigma; staminate plants unknown ...... 
Marginata 
Pandanus marginatus sp. nov. (sect. Marginata) 
Fig. 275 
diagnosis holotypi: Planta 2.5-4 m alta, "caule 
plerumque eramoso, radicibus fulturosis paucis brevi- 
bus,” foliis 1.9-2.26 (+0.3-0. 5?) m longis in medio 
4 cm latis supra basem 3.5 cm latis subtiliter coriaceis 
1 B. P. Bishop Museum, Honolulu, Hawaii 96819, 
U. S. A. Manuscript received March 7, 1964. 
supra viridibus infra palliditer viridibus et ad basem 
glaucis LJ-sukatis 2-plicatis in sectione mediali cum 
42 nervis parallelis secundariis nervis tertiis in parte 
+» ultima semivisibilibus et reticulis oblongis for- 
mantibus, lamina paene ligulata sed in parte % ultima 
ad apicem gracilem diminuenti (apex deest), basi 
inermi pallida ex 3-6 cm marginibus cum aculeis 
1—1.8 mm longis 3-6 mm separatis rectis subulatis ad 
arcuati-subulatis adscendentibus pallidis vel cum 
apicibus minime brunneis, midnervo infra in parte % 
infera inermi, in sectione mediali marginibus cum 
aculeis 1.3-1. 5 mm longis 4-8 mm separatis subulatis 
valde adscendentibus pallidis cum apicibus brunneis, 
midnervo infra cum aculeis 0.7-1 mm longis 4—6 mm 
separatis arcuati-subulatis valde adscendentibus strami- 
neis, infructescentia cum syncarpio solitario pendenti 
subcylindrico aurantiaci-rubro, syncarpio 27 cm longo 
7 cm diametro, drupis 17-18 mm longis 6—10 mm 
latis 5-7 mm crassis elliptico-oblongis 4-6-angulosis 
parte % supera libera apice obtuso, pileo 3-4 mm alto 
laevi lucido inter angulas contrahenti, stigmate 2-2.5 
mm longo elevato plus minusve horizontali brunneo 
papilloso hippocrepiformi ex lineis duobus parallelis 
pallidis stylaribus invaginatis et sinu centrali adjacenti, 
endocarpio centrali ellipsoideo osseoso obscure rubri- 
brunneo lateribus 1-1.2 mm crassis intra laevibus 
lucidis, semine 6-7 mm longo, mesocarpio apicali cum 
fibris marginalibus fortibus eis in apice convergentibus 
et cum membranis transversis paucis brunneis, meso- 
carpio basali fibroso et carnoso. 
diagnosis of holotype: Plant 2.5-4 m tall; 
"stem usually unbranched; prop roots few, 
short”; leaves 1.9 (+0.3-0. 5?) m long, 4 cm 
wide near the middle, 3.5 cm wide near the 
base, thin coriaceous, green above, pale green 
below and glaucous near the base, LJ-sulcate, 2- 
pleated, at midsection with 42 parallel secon- 
dary veins in each half, the tertiary cross veins 
faintly seen in outer half forming oblong 
meshes, blade almost ligulate, but in outer % 
tapering toward the slender apex (this lost in 
ours), base unarmed, pale; beginning at 3-6 cm 
up the margins with prickles 1—1.8 mm long, 
3-6 mm apart, straight subulate to arcuate 
subulate, ascending, pale or with faint brown 
tips; the midrib below unarmed for the lower 
Yq ; at midsection the margins with prickles 
1.3— 1.5 mm long, 4-8 mm apart, subulate, 
520 
