184 ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUTTA. [D. eollariferus 
and terminating in a rather long and slender cirrus; petiole elongate (40 cm, in one 
specimen), slightly flattened-biconvex with obtuse clawed edges in its upper part, the 
edges near the base acute and powerfully armed with very long, spreading spines, 
very much like those described above, but often fascicled 2-3 together and diver- 
gent; the under surface of the petiole is unarmed, the upper is sparingly and 
minutely prickly; the rachis on its upper surface has a smooth salient angle with flat 
side-faces immediately from the insertion of the lowest leaflets ; beneath it is armed 
with ternate claws which become smaller and regularly half-whorled on the cirrus. 
Leaflets rather numerous, about 40 in all, very inequidistant, more or less distinctly 
aggregated into 5-6 groups, all in one plane (not pointing different ways) and 2-3 
em, apart in each group, the groups of one side alternating with those of the 
opposite side, and therefore with not very long vaeant spaces interposed; they are 
thinly papyraceous, green, slightly paler beneath, linear, narrow and long, the lower | 
leaflets being the largest (35-40 cm. long, 10-15 mm. broad), the upper a good deal 
shorter but not narrower, all very gradually acuminate to a subulate—and at the 
apex—bristly tip; on the upper surface the mid-costa is acute and glabrous or has a 
straggling spinule near the apex; the secondary nerves are slender and all smooth; 
on the under surface 5 nerves are finely bristly but the mid-costa has the bristles 
closer than the others; transverse veinlets rather sharp and numerous, much interrup- 
ted; margins very minutely spinulous. Male spadiz erect, strict, panicled-cupressiform, 
about 50 em. long and with 6-7 partial inflorescences in one specimen) supported by a 
strongly flattened unarmed pedicellar part; primary spathes thin, membranous, decidu- 
ous, exsuccous; secondary and tertiary spathes very shortly infundibuliform or sub- 
bracteiform, produced at one side into a triangular, acuminate, exsuccous and usually 
lacerated point; partial inflorescences small and with few branchlets, the latter short 
(8-5 cm. long) with 3-4 spikelets on each side; spikelets spreading, 10-20 mm. long, 
quite flat, 8 mm. broad, of a cinnamon-brown colour when dry with 10-15 
closely packed, bifarious, horizontal flowers on each side; spathels very closely packed, 
bracteiform, horizontal or slightly deflexed, broadly and shallowly cymbiform, 
puberulous-furfuraceous; their apex produced at one side into a triangular point, 
which protrudes beyond the involucre; the latter rather deeply cupular, obliquely 
truncate and entire at the mouth, two-keeled on the posticous side, not callous in the 
axilla. Male flowers terete, very slender, at times slightly arched, obtuse, 4 mm. 
long, the calyx tubular, broadly 3-toothed, the corolla more than twice as long as 
the calyx. 
Haprrat.—Borneo. I collected this fine species in a sterile condition on Mount 
Mattang near Kuching in Sarawak. (P. B. No. 1923.) Found again in the same 
place and with male flowers by J. Hewitt. (Herb. Kew. and Manila.) Malayan name 
in Sarawak ‘“ Rotang Rappang.” 
OBSERVATIONS.—It is easily distinguishable from the allied forms by the two large 
membranous reversed collars immediately below the base of the petiole; by the 
want of collars or rows of spiculae turned upwards; and by the long  needle- 
like, straw-coloured spines around the mouth of the leaf-sheaths, and at the base of 
the petiole. D. collariferus seems allied to D. geniculatus, more than to any other known 
