Page 315: Revision of Pandmus , 16. Thailand, Vietnam— St. John 
477 
Pandanus bipollicaris sp. nov. (sect. Rykia ) 
Figs. 197, 205 a, b 
DIAGNOSIS HOLOTYPI: Acaulescens caespi- 
tosus 80- cm diametro, foliis 2-3 m longis 4-5 
cm latis supra obscure viridibus lucidisque infra 
viridibus vel luteo-viridibus supra sulcatis 2- 
plicatis in sectione mediali cum 36 nervis 
secundariis parallelis in quoque latere, nervis 
tertiis transversis multis et in sicco conspicuis 
et reticulis quadratis vel oblongis formantibus, 
laminis ligulatis sensim per 40 cm ultimas in 
10 cm apice subulato trigono contract is eo 
circa 10 cm ex apice 2 mm la, to, basi amplexi- 
cauli inermf luclda cupracea et ex 12-15 cm 
marginibus cum aculeis 3-6 mm longis 10- 
20 mm separatis crassiter subulatis subarcuato- 
adscendentibus stramineis vel nigris, midnervo 
infra ex 14-17 cm cum aculeis 4-6.5 mm longis 
10-20 mm separatis crassiter subulatis arcuatis 
reflexis, in sectione mediali marginibus cum 
aculeis 2.5-3 mm longis 14-30 mm separatis 
arcuato-subulatis valde adscendentibus basibus 
incrassatis, in apice contractescentibus margini- 
bus undulatis et cum subulato-serris 1.5-2 mm 
longis 1.5-5 mm separatis, midnervo infra an- 
gusto et cum serris simulantibus, in apice mar- 
ginibus et midnervo infra cum serrulis 0. 5-0.8 
mm longis 1.5-3 mm separatis, inflorescentia 
foeminea terminali erecta cum syncarpio solita- 
rio, pedunculo 20 cm longo 12 mm diametro 
trigono folioso-bracteato, syncarpio ex bracteis 
tandem siccis et papyraceis subclauso, syncarpio 
11.5 cm longo 6.7 cm diametro ellipsoideo sub- 
trigono viridi cum circa 672 drupis, eis 20-25 
mm longis 5-9 mm latis 4-8 mm crassis anguste 
cuneatis apice hemisphaerico vel pyramidali- 
hemisphaerico 5-7-anguloso, corpore 19-22 mm 
longo, basi pile! 5-6 mm alto viridi glauco, 
stylo 3-4 mm longo brunneo lucido osseoso 
proxime curvato lato compresso cornuformi bi- 
fido lobis 0.5-2 mm longis deltoideis (raro inte- 
gro), stigmatibus 1.5-2. 5 mm longis late ovato- 
lanceolatis proximis paene ad apicem productis 
papUlosis brunneis, endocarpio in parte l A in- 
feta oblongo-ellipsoideo apice truncate intra 
pallidi lucido lateribus lateralibus 0.2 mm cras- 
sis osseosis brunneis exteriori sillonati, sernini- 
bus 7-8 mm longis 3-3.5 mm diametro, meso- 
carpio apicali albi medullosi in media sine fibris. 
mesocarpio basali 2-3 mm longo in lateribus 
fibroso in media carnoso. 
DIAGNOSIS OF holotype: Stemless herb with 
several shoots, forming a clump 80 cm in di- 
ameter; leaves 2-3 m long, 4-5 cm wide, above 
dark olive green and shining, below green to 
yellowish green, above with V-shaped furrow 
over the midrib and two lateral pleats, at mid- 
section with 36 secondary parallel veins in each 
half, tertiary cross veins numerous and visible, 
but on drying conspicuous, forming squarish or 
oblong meshes, blade ligulate, gradually con- 
tracted in the last 40' cm to a 10 cm subulate, 
trigonous apex, this about 10 cm down 2 mm 
wide, the base amplexicaul, unarmed, shining, 
dull copper-colored, beginning at 12-15 cm the 
margins with spines 3-6 mm long, 10-20 mm 
apart, thick subulate, slightly upcurved, stramin- 
eous to blackish; the midrib below beginning 
at 14-17 cm with spines 4-6.5 mm long, 10-20 
mm apart, heavy subulate, arcuate, reflexed; at 
midsection the margins with prickles 2.5-3 mm 
long, 14-30 mm apart, arcuate subulate from a 
thickened base, strongly ascending; the midrib 
below unarmed; in the contracting part near the 
tip the margins undulate and with subulate- 
serrae 1.5-2 mm long, 1.5-5 mm apart; the nar- 
row midrib below with similar serrae; on the 
apex the margins and midrib below with ser- 
rulations 0. 5-0.8 mm long, 1.5-3 mm apart; 
pistillate inflorescence terminal, erect, bearing 
one syncarp; peduncle 20 cm long, 12 mm in 
diameter, 3 -sided, leafy bracted; syncarp sur- 
rounded and nearly hidden by bracts that be- 
come dry and papery; syncarp immature but ap- 
parently about full sized, 11.5 cm long, 6.7 cm 
in diameter, ellipsoid, slightly 3 -sided, green, 
bearing about 672 drupes, these 20-25 mm long, 
5-9 mm wide, 4-8 mm -thick, narrowly euneate, 
the apex hemispheric or pyramidal-hemispheric, 
5-7 -angled, the body 19-22 mm long; p ileus 
with its base 5-6 mm high hemispheric or pyra- 
midal-hemispheric, green, glaucous (immature); 
style 3-4 mm long, brown, shining, bony, proxi- 
mally curved, broad, flattened hornlike, equally 
or unequally bifid, the lobes 0.5-2 mm long, 
deltoid (rarely unbranched this mostly on ter- 
minal drupes); stigmas 1.5-2. 5 mm long, 
broadly ovate-lanceolate, proximal, following 
each lobe almost to the tip, papillose, brown; 
endocarp in lower oblong-ellipsoid, the apex 
