Revision of the Genus Pandanus Stickman, Part 20 
New Species from India and Thailand 
Harold St. John 1 
The following new species of Pandanus 
from India and Thailand are, all except one, 
based upon collections made by botanists other 
than the writer. 
SPECIES FROM INDIA 
Section Rykia 
Pandanus assamensis sp. nov. (sect. Rykia). 
Fig. 225 
DIAGNOSIS HOLOTYPI: Caule 6-7 mm diame- 
tro brunneo lucido laevi, internodis 10-11 mm 
longis, foliis 28-30 cm longis 22-27 mm latis 
chartaceis supra viridibus infra pallidioribus 
1- sulcatis 2-plicatis in sectione mediali cum 15- 
lb nervis parallelis secundariis ubique con- 
spicuis in quaque media, nervis tertiis nullis, 
laminis infra cuneatis proxima basem 15-16 mm 
latis ligulatis ad apicern subiter in apice subulato 
3 cm longo 0. 5-0.7 mm lato contractis basi am- 
plexicauli inermi sed ex 2.5-3 cm marginibus 
cum aculeis 1-2 mm longis 1.5-3 mm separatis 
rectis subulatis adscendentibus apicibus subru- 
bris, midnervo infra ex 5-5.5 cm cum aculeis 
2- 2.5 mm longis 1 4—2 6 mm separatis subulatis 
reflexis basibus incrassatis. in sectione mediali 
marginibus cum aculeis 0.3-0. 5 mm longis 1-8 
mm separatis acicularibus adpresse adscendenti- 
bus, midnervo cum aculeis paucis 0.7-0. 8 mm 
longis 20-25 mm separatis crassiter subulatis 
reflexis basibus latis, in apice caudato margini- 
bus et midnervo infra cum aculeis 0.3-0. 5 mm 
longis 0.2-1 mm separatis validis arcuatis sub- 
ulatis adscendentibus; inflorescentia foeminea 
cum syncarpio terminali erecto solitario, pedun- 
culo 8 cm longo 3 mm diametro 3-laterato supra 
crassiori et in apice 4 mm diametro cum bracteis 
paucis, syncarpio 3.5 cm longo 2.5 cm diametro 
1 B. P. Bishop Museum, Honolulu, Hawaii 96819, 
U.S.A. Manuscript received August 13 , 1962 . 
oblongo-ellipsoideo cum circa 720 drupis eis 
11-12 mm longis 2 mm latis et crassis 5-6- 
angulatis corpore 7-8 mm longo oblongo- 
oblanceoloideo, pileo cum basi 1.5-2 mm alto 
semiellipsoideo laevi vel minime papilloso, stylo 
5-6 mm longo graciliter subulato in basi valde 
reflexo, drupis superis cum stylis terminalibus 
illis latioribus cum stylis lateral ibus, stigmate 
4-5 mm longo lineari proximo brunneo papil- 
loso fere ad apicern extento, endocarpio supra- 
mediali lateribus 0.07 mm crassis cartilagineis 
stramineis, mesocarpio apicali parvo medulloso, 
mesocarpio basali in lateribus fibroso intra 
carnoso. 
DIAGNOSIS OF HOLOTYPE: Stem 6-7 mm in 
diameter, brown, shining, smooth, the internodes 
10-11 mm long; leaves 28-30 cm long, 22-27 
mm wide, chartaceous, green above, pale green 
below, 1 -ribbed, but 2 -pleated, at midsection 
with 15-16 parallel secondary veins in each half, 
these conspicuous on both sides throughout, no 
tertiary cross veins, cuneate below and just above 
the base only 15-16 mm wide, ligulate, near 
the apex abruptly contracted to a subulate tip 
3 cm long, this 0. 5-0.7 mm wide, the base am- 
plexicaul and unarmed, but starting 2.5-3 cm up 
the margins with prickles 1-2 mm long 1.5-3 
mm apart, straight subulate, ascending, reddish 
tipped; the midrib below beginning at 5-5.5 
cm with prickles 2-2.5 mm long, 14—26 mm 
apart, subulate, reflexed, heavy based; at midsec- 
tion the margins with prickles 0.3-0. 5 mm long, 
1-8 mm apart, acicular, appressed ascending; 
the midrib below with a few prickles 0.7-0.8 
mm long, 20-25 mm apart, stout subulate, broad 
based, reflexed; on the caudate apex the margins 
and midrib below with prickles 0.3-0. 5 mm 
long, 0.2-1 mm apart, stout, arcuate subulate, 
ascending; pistillate inflorescence with one ter- 
minal, erect, solitary syncarp; peduncle 8 cm 
long, 3 mm in diameter, 3 -sided, few bracted, 
523 
