Revision of the Genus Pandanus Stickman, Part 7 
New Species from Borneo, Papua, and the Solomon Islands 
Harold St. John 1 
This seventh part of the series contains de- 
scriptions of miscellaneous new species from is- 
lands in the tropical Pacific. 
Pandanus Andersonii sp. nov. (sect. Acro- 
stigma ) 
Figs. 33-34 
NOM. VERN.: "surong irit.” 
DIAGNOSIS HOLOTYPI: Pedunculo ad 10 cm. 
longo 2.5 cm. diametro obtuse trigono ebrac- 
teato erecto, syncarpiis 1-3 spicatis in inflores- 
centia erecta 15 cm. longa evidenta, syncarpiis 
11.5-14 cm. longis 13.5-14 cm. diametro late 
ellipsoideis vel subglobosis obtuse trigonatis 
cum drupis numerosissimis, drupis 35-40 mm. 
longis 6-7 mm. latis 5-6 mm. crassis fusiformi- 
bus 5-6-angulatis corpore 18-21 mm. longo 
oblongo-ellipsoideo pileo quam corporem lat- 
iore 13-17 mm. longo in stylo sensim dimi- 
nuenti, parte principali brunnea ex squamis 
late deltoideis lucidis dense congregatis erectis 
ex axile perpendicularibus, drupis in fasciculis 
dehiscentibus, et pileis in laminis grandibus 
dehiscentibus, stylo 5-7 mm. longo subulato ar- 
cuato stigmatam distalem ferento, stigmate 4-5 
mm. longo sublineari in fissura, endocarpio in 
Va parte infera albo cartilagineo lateribus 0.2 
mm. crassis, mesocarpio apicali cavernoso ellip- 
soideo 8-9 mm. longo, mesocarpio basali 5 mm. 
longo fibroso et carnoso. 
DESCRIPTION OF ALL SPECIMENS EXAMINED: 
"Roots ramify below water table; rhizome at 
surface level.” Stem 20—25 cm. long, 1.2 cm. in 
diameter, assurgent, forking and forming dense 
thickets; leaves 2.6-6.8 m. long, 2.6-2.8 cm. 
wide, coriaceous, ligulate, 3 -nerved and plicate, 
AA-shaped in cross section, the under side slightly 
paler, abruptly narrowed to the heavy subulate 
tip which 10 cm. down is 13 mm. wide, the 
base entire and amplexicaul, but beginning 9 
1 Botanist, B. P. Bishop Museum, Honolulu, Hawaii. 
Manuscript received September 13, I960. 
cm. up the margins with stout serrations 2-2.5 
mm. long, 5-13 mm. apart, pale; the midrib 
below beginning 7-8 cm. up with reflexed 
prickles 4-6 mm. long, 7-17 mm. apart, stout 
arcuate subulate, becoming brown; at midsec- 
tion the margins with serrations 1-1.5 mm. 
long, 5-10 mm. apart, pale below, the tips 
brownish; the midrib unarmed; near the tip the 
margins and midrib below with serrations 0.5-1 
mm. long, the marginal 2-3 mm. apart, those 
of the midrib 3-8 mm. apart; on the upper side 
the two secondary ribs with serrations about 0.5 
mm. long, 9-30 mm. apart; pistillate inflores- 
cence ascending, not concealed; peduncle up to 
10 cm. long, and 2.5 cm. in diameter, obtusely 
trigonous, bractless, erect; heads solitary or 2-3 
in a spike 15 cm. long; syncarps 11.5-14 cm. 
long, 13.5-14 cm. in diameter, broadly ellipsoid 
to subglobose, obtusely trigonous, bearing very 
numerous drupes (several hundred); drupes 35- 
40 mm. long. 6-7 mm. wide, 5-6 mm. thick, 
fusiform, 5-6-angled, the body 18-21 mm. long, 
oblong-ellipsoid; the pileus the widest part, 
lance conic, 13-17 mm. long, narrowing grad- 
ually into the style, the body appearing rough 
and brown, from the dense outgrowth of closely 
packed, brown, shining (perhaps viscid) broad 
triangular scales, erect from the surface and all 
perpendicular to the drupe axis; drupes shed- 
ding in bundles and the pileuses cohering, early 
shedding in great sheets; style 5-7 mm. long, 
subulate, arcuate, glabrous, bearing a distal 
stigma 4-5 mm. long, almost linear in an open 
crack on the curved style; endocarp in lower 
V4, white, cartilaginous, the walls 0.2 mm. thick; 
apical mesocarp an empty cavern, 8-9 mm. 
long, ellipsoid; basal mesocarp 5 mm. long, 
fibrous and fleshy. 
HOLOTYPUS: Sarawak, Lawas District, Kayan- 
geran Forest Reserve, in "Sempilor” ( Dacry - 
dium Beccarii var. subelatum) forest, 10 ft. alt., 
Nov. I960, /. A. R. Anderson (fruit only) 
(SARF). 
576 
