Page 475: Revision of Pandanus , 31 — St. John 
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margins with prickles 0.4-0. 8 mm long, 4-10 
mm apart, subulate with a long lower side, com- 
pressed, almost appressed ascending, stramine- 
ous with red tips, alternately large and small, 
the nearby midrib unarmed; infructescence a 
spike of 3-4 syn carps; peduncle 9-14 cm long; 
apical syncarp the largest, 6-6.5 cm long, 3.8-5 
cm in diameter, the lateral syn carps 4-5.5 cm 
long, 3.5-5 cm in diameter; drupes 19-26 mm 
long; pileus 2-4 mm high; style erect, 3-4 mm 
long. 
holotypus : Borneo, fames Motley 38 (k 
mus.). 
specimens examined: Sarawak, Ulu Begrih, 
Bawan, Balingian, ridge top, leached yellow 
sandy soil, mixed Dipterocarp forest, low alti- 
tude, 20-10-63, Paul Chat S. 19, 453 (sar). 
Indonesian Borneo: West Kutei, Mt. Pali- 
masan, on Belajan R., near Tabang, foothills 
along Meu R., 100 m alt., 6 Sept. 1956, A. 
Kostermans 12,726 (l). 
discussion: P. sulcatus is a member of the 
section Rykia, as is its closest relative, P. angus- 
tus St. John, of Hayoep, southeast Borneo, a 
species with the drupes 15-19.5 mm long, 6.5- 
8 mm wide, the upper 1/3 free; pileus 3-4.5 mm 
high ; endocarp in lower % ; seed 6 mm long ; 
leaf margins beginning at 5-6 cm from the base 
with serrae 1-1.6 mm long, 5-8 mm apart, 
yellowish. P. sulcatus has the drupes 19-26 mm 
long, 7-12 mm wide, the upper free; 
pileus 2-4 mm high; endocarp central; seed 
4 mm long; leaf margins beginning 3-4 cm 
from the base with prickles 0.8-1. 5 mm long, 
3-7 mm apart, subulate-serrulations to arcuate 
stout subulate prickles, ascending, stramineous. 
The collector, James Motley, was an engineer 
who developed a coal mine near Kalangan, but 
eventually was murdered by the natives. He col- 
lected a good many plants, and already has one 
Pandanus species named for him. 
The new epithet is the Latin adjective sulca- 
tus, furrowed, and is given with reference to 
the deep central furrow of the leaves. 
