18 ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUTTA. (C. corrugatus. 
an acuminate, slender, bristly tip; the upper pair of side leaflets are very approxi- 
mate to the terminal one, which is composed of two, united the two-thirds of 
their length, and forms a narrow bilobed flabellum, about as long as the nearest 
leaflets; its lobes are obovate and abruptly contracted into a finely acuminste tip; all 
are herbaceous, very slenderly yet sharply 3-costulate, entirely covered on both 
surfaces and on the margins with very soft light coloured hairs, which rest on a 
small bulbous base; transverse veinlets distinct, much interrupted, not very crowded; 
the upper pairs of leaflets are 16-17 cm. long, 20-25 mm. broad; the others 
somewhat smaller. Other parts unknown. 
Hasitat. Dutch Borneo, apparently in the N. W. part, coilected by Tetjsmann, 
but the precise locality is not stated (Buitenzorg Herbarium No. 16320). Vernacular 
name *'Rotan lalat.” 
OBsERVATIONs.— Calamus hypertrichosus is the most peculiar species in the group 
to which it belongs, that of C. javensis, which have leaves with 3-costulate leaflets, 
the two of the apex being united in a bilobed flabellum. It is however dis- 
tinguishable from all, by the soft hairy down whieh entirely covers both surfaces 
and the margins of the leaflets; it is also peculiar in that the indumentuin covers 
the long and terete petioles. It approaches C. javensis var. azicularis by its leaves 
having very few leaflets and a long terete petiole. 
SurPL. PLATE 10.—Calamus hypertrichosus Becc. The type specimens No. 16330 
in the Buitenzorg Herbarium. 
33. CaLAUS CORRUGATUS Bece. 
It has been found sgain by Hewitt in Sarawak on Mount Poe (July 1908) 
according to a specimen from the Sarawak Museum, now in the Herbarium at 
Kew. ‘l'his specimen corresponds as to the leaves and the leaf-sheath to plate 
43 of this volume, and bears a fruiting spadix of which I subjoin a description. 
This female spadiz is very similar to that of C. javensis and is attached by 
means of a callosity exactly to the mouth of its leaf-sheath opposite to the base 
of the petiole; it is very slender, filiform, 1°15 m. long, and carrys only 3 
partial inflorescences towards its upper end. Primary spathes very narrowly tubular, 
very closely sheathing, very finely aculeolate especially in their lower slender part; 
they end in a small lanceolate auriculiform limb which is produced beyond the 
insertion of its respective partial inflorescence. The partial inflorescences are small 
8-30 em. long, carry only 2-4 spikelets on each side, and are attached to the Rara 
axis by means of a rather conspicuous axillary callus. Secondary spathes tubular, 
slightly enlarged above, unarmed, puberulous-furfuraceous, ciliolate at the mouth. 
Spikelets spreading or horizontal, 4-5 cm. long, with about 12 flowers on each 
side; spathels bracteiform with a slightly concave horizontal bluntish limb he 
volucrophorum slightly concave, laterally attached to the base of the spathel above 
its own, somewhat produced at one side and subtending the base of the neuter 
flower; involucre cupular, entire; areola of the neuter flower rather largo, almost 
crescent-like and with raised edges. Fruit ovoid-elliptical, rounded at both ends but 
surmounted by a conspicuous cylindrical slender mucro, 3 mm. long upon 
which rest the remains of the stigmas. The frui is 10-12 mm. long—not taking 
