110 ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUTTA. [C. mattanensis. 
indumentum, which, after its fall, leaves the surface of the spathes and of the 
main axis very minutely scabrid: it is 40 cm. long, has 5 small gradually 
diminishing partial inflorescences, and terminates in a small tail-like appendage ; the 
lowest primary spatke, which sheaths the peduncular part of the spadix, is tubular, 
9 cm. long, flattened, very acutely two-edged and slightly prickly on the edges ; 
the upper primary spathes are similar to the lowest, but are slightly enlarged above, 
somewhat flattened, keeled and slightly prickly on the back, obliquely truncate, 
entire and densely ciliate-bearded at the mouth and prolonged at one side into 
a triangular acuminate point; partial inflorescences small, the lowest 6 cm. long, 
‘with 6 small, gradually diminishing, arched-scorpoid spikelets on each side, but 
with an unilateral direction; secondary spathes tubular-infundibuliform, scabridulous- 
tomentose, truncate and ciliate at the mouth; male spikelets very small, with the 
flowers alternate, subunilateral, but in 2 series; the lower spikelets (largest) are 
8-10 mm. long and have 5-6 flowers in each series;  spathels bracteiform, 
- triangular, deflexed, acute, striately-veined ; involucre slightly concave or explanate, 
` bilobed and as it were formed by two ovate bracts connate by their bases. Male 
flowers with a broad base, subpyramidate-trigonous, acute, 3 mm. long, 2 mm. 
broad; the calyx broadly and deeply 3-lobea, the lobes apiculate ; the corolla 
slightly longer than the calyx, its segments ovate, acuminate ; stamens with 
filaments inflected at the apex; anthers sagittate; rudimentary ovary forined by 
3 rather conspicuous subulate bodies. The leaf which accompanies this male spadix 
is somewhat smaller than those already described, is 55 cm. long in the pinniferous 
part, and has 10 inequidistant leaflets on each side, of which the mesials are 20-23 cm. 
long, 15-18 mm. broad, otherwise it exactly corresponds to the description already 
given,  - 
i To C. mattanensis probably belongs the spadix with young fruit which I have 
attributed to C. ferrugineus and represented on the right hand side of plate 225 
‘of this volume, and indeed @. mattanensis is very closely related to C. ferrugineus 
especially by the spadix so den:ely covered with a rusty furfuraceous scurf; but, 
in €. ferrugineus the leaflets are very peculiarly deflexed (see observations to 
€. ferrugineus). C. mattanensis with ©. ferrugineus and C. retroflexus form a small 
subdivision of the group to which 0. palustris belongs, agreeing in having the 
spadices of the two sexes very similar and non-cirrifercus, and in the leaflets acquiring 
a yellowish colour in, the Herbarium specimens. | 
SUPPL. Prare 61.—Calamus mattanensis Bece. Portion of the sheathed stem 
with an entire leaf and a male spadix from Hewitts specimen in the Herbarium 
at. Kew. .,. , 
© CALAMUS MATTANENSIS var. i Sagur Becc. 
: Descrrprioy.—Scandent, very slender. Sheathed-stem 8-10 mm. in diameter. Leaf- 
sheaths gibbous-plieate above, very obliquely truncate at the mouth, very thinly 
rusty-furfuraceous (not scabrid), armed with solitary, scattered, | relatively robust, 
slightly deflexed, rigid spines, 10-12 mm. long, furnished above the rather broad 
base with a distinct swelling, and showing the outline of their forms stamped on 
the surface of the leaf-sheaths. Ocrea inconspicuous, axillary and very shortly 
