C. corrugatus] BECCARI. MONOGRAPH OF THE GENUS CALAMUS. 187 
Hasrrar.—Borneo; on Mount Mattang, near Kuching in Sarawak (Beccari P. B. 
No. 1909.)— This species is represented in the Herbarium at Kew by a female 
flowering specimen collected by Lobb, very probably also in Sarawak. Native names. 
in Sarawak ‘Rotang Jangut,’? ‘R. Battu, ‘R. Kawat? a i 
It produces the most slender Rotang known to me. It is very tough and of 
very good quality, much employed by the natives for binding purposes, basket- 
making, ete. 
OxnstRvaTIons.—This is perhaps not so much a distinct species as an aberrant 
form of C. javensis closely related to var. tenuissimus from which, however, it differs 
in the infloresences being reduced to a single spikelet and in the more numerous 
and narrower leaflets, of which the upper pair are usually highly connate as in the 
different forms of C. javensis. ! 
PLATE 42.—Calamus filiformis Bece. The upper part of a plant with a female 
spadix in flower and another intermediate portion, from P. B. No. 1909 in Herb. 
Beccari. 
33. CALAMUS CORRUGATUS Becc. in Rec. Bot. Surv. Ind. ii, 201. 
Description.—Scandent; very long and slender. ^ S/waíhed stem 4-5 mm. in diam. 
Leaf-sheaths flagelliferous, obliquely truncate at the mouth, unarmed, but conspicuously 
marked by many approximate tranverse annular ridges or prominent wrinkles. — Ocrea 
very short, more or less hairy-furfuraceous. Leaf-sheath flagella very slender, filiform, 
unamed in their basal portion and finely clawed upwards. Leaves short, 20-35 cm. 
long, not cirriferous ; petiole very short (about 1 cm. long), hairy-furfuraceous; rachis 
also furfuraceous, slender,’ filiform, almost round, striate longitudinally, armed below 
with weak, solitary or ternate, semi-verticillate claws ; leaflets very few (5 on each 
side), perfectly opposite, forming remote pairs, elliptic-lanceolate, narrowed to the. base, 
where acute and slightly callous: at their insertion, subulately acuminate at the 
apex, thinly papyraceous, about the same colour on both surfaces, plicate longitudinally 
and apparently many-nerved, but furnished with only three acute slender costa 
(which are naked on both surfaces) and some slender secondary nerves; 
transverse veinlets sharp and rather approximate; margins acute, smooth ; the 
largest leaflets, the mesial, horizontal, 12-13 cm. long, 2:5 em. broad, the two 
of the terminal pair a little smaller than the side ones, united up to about 
their middle, the two near the base, the smallest, deflexed and callous at 
their insertion. Spadiccs not seen. 
HaBrrAT.—Borneo; on Mount Mattang, near Kuching in Sarawak (Beccari P. B. 
No. 1910.)—There is a sterile specimen of this species in the Kew Herbarium 
collected by Lobb, probably also in Sarawak, in 1853. 
-— QOgservattons.—This is a very elegant and delicate species, which produces one 
of the smallest Rotangs of good quality. It is easily distinguished among those 
of the group of C. javensis by the ridged or wrinkled, not spinous, surface of 
the leaf-sheaths, and by the few, perfectly opposite and horizontal leaflets, which 
are approximate on each side of the rachis in remote pairs. € j - 
Ann, Roy. Bor. Garp. Carcurra, Vor. XI. 
