16 ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUITA. [C. acuminatus. 
‘split and spread open at the apex into a membranous limb, which subtends the base 
of their respective spikelets. 
HaBrrar.—N. W. Dutch Borneo; "du. Mandai in the Residency of B uias 
(Hallier No. 2569 in Buitenzorg Herbarium). 
SuPPL. Pirate 7.—Calamus javensis var. tetrastichus B/, subvar. mollispinus Bece. 
The type specimen in Buitenzorg Herbarium. 
CALAMUS JAvENSIS Bl. var. INTERMEDIUS Becc. 
Although not exactly agreeing with the Malayan plant we may consider as 
belonging to this variety Hullivr’s No. 2134 (Herb. Buitenzorg) collected in N. W. 
Dutch Borneo at Sungei Kenepai, Residency of Sambas, native name “R. angkut." 
The leaf-sheaths are armed with scattered, rather short, light coloured, slightly 
ascendant spines; the two lowest leaflets are ascendant and rather larger than the 
following; the petiolar part is 2-3 cm. long. 
CALAMUS JAvEN8Is Bl. var. suBfÉAEVIS Becc. 
To this variety belong some specimens collected by Hallier in N. W. Dutch 
Borneo at Sungei Kenepai, Residency of Sambas (No. 2130 in Buitenzorg Herbarium), 
In some leaves the petiole is as much as 45 cm. long, terete, and narrowly grooved 
on the upper surface, Probably C. javensis assumes this form in its first period of 
life, and when it grows rapidly in rich soil. I have only seen sterile specimens 
of it. 
31a, CALAMUS ACUMINATUS. Becc. n. sp, 
DescripTion.—Scandent, slender. Sheathed stem 6-10 mm. in diameter, Leaf- 
sheaths distinctly striate longitudinally, unarmed or furnished especially in their 
lower part with a few, slender, subulate, solitary, horizontal or slightly deflexed, 5-10. 
mm. long, light-coloured spines. Ocrea membranous, ciliate, rather elongate (+ 2 cm. 
long) in young shoots, later marcescent and deciduous. ^ Leaves about 40 cm. long; 
petiole quite obsolete; rachis armed on the back with small solitary claws; leaflets 
10-i2 on each side, subequidistant, alternate or subopposite, thinly papyraceous, 
narrowly lanceolate-elliptical, gradually acuminate from about the middle to an 
acute base and above very gradually long-acuminate to a finely subulate, slightly 
ciliate tip; coste 3, slender, sparingly  spinnlous; margins finely  spinulous- 
ciliate; the intermediate leaflets about 20 cm. loug, 2 cm. broad; the lowest 
smaller, horizontal or more or less deflexed; the two of the terminal pair about 
two-thirds connate, somewhat shorter than the intermediate and about as broad. 
Male spadiz .... Female spadic slender, flagelliform, inserted with a very conspicuous 
axillary callus; primary spathes unarmed or minutely prickly, all or at least the 
upper terminating in a narrowly lanceolate, acuminate membranous, ear-like limb, 
produced a good deal beyond the insertion of their respective partial inflorescences; 
the latter have a distinct but flattened axillary callus and are not kept divaricate by 
this but are erecto-patent; the largest (lowest) are 15-20 cm. long, and carry 3-4 
spikelets on each side and terminate in a very small inconspicuous setiform 
appendage; the axis of the partial inflorescences is slender and strongly zig-zag sinuous ; 
the secondary spathes are very narrow and very tightly sheathing in their lower part and 
