166 ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUTTA. [C. digitatus 
veined, with: 3- short. broad acute lobes; corolla twice as long as the calyx, divided down 
to the lower third of its length into 3 linear, callous, apiculate segments, which are 
strongly longitudinally striato outside; stamens in two series of unequal length, their 
filaments united as high as the middle of the corolla, in the free portion thick near 
the base, subulate and not inflected at the apex; anthers sagittate-lanceolate, acute, the 
connective and the filament black when dry; rudimentary ovary very small, formed by 
three small approximate clavate bodies which are shorter than the filaments. Female 
spadiz and fruit unknown. 
Hasrrat.—Ceylon: in the neighbourhood of Galle, Thwaites. I have seen a 
good specimen of this species in the Herbarium at Paris, gathered at Caitura by 
Leschenault in July 1820. 
OBSERVATIONS.—The specimens of the ‘Ceylon Plants,” which exactly agree with 
the description of C. pachystemonus of Thwaites, bear the No, 2334 and were prepared 
from plants originally found in the jungle near Galle and introduced into the Botanical 
Garden at Peradeniya; but with the same No. 2334 specimens of C, digitatus have 
been also distributed. And indeed C. pachystemonus is closely related to @. digitatus 
with which it has been amalgamated by Thwaites, but from which it is easily distin- 
guishable by the pinnate leaves, as described above. The male flowers are also larger 
n €. pachystemonus than in €. digitatus, and are callous at the top, with the filaments 
‘of the stamens thicker, shorter and more agglutinate. 
C. pachystemonus, C. digitatus and C. radiatus form a small group, peculiar to 
Ceylon , distinguished chiefly by the elongate curved flowers with biseriate stamens and 
filaments. not inflected at the apex and with erect anthers when in the bud. 
Leschenault’s specimen has the leaf with two leaflets on each side of the rachis 
“besides the terminal pair; the leaflets have not the small spinules on the mid-costa 
on the lower surface, as in Thwaites’s specimens. 
Prate 27.—Calamus pachystemonus Thw. An entire leaf seen from the lower 
surface; the base of another seen from the upper one and an entire male il 
from Thwaites’s specimen in Herb. Kew. 
99. CaraMUs DiIGITATUS Becc. in Hook. f. Fl. Brit. Ind. vi, 442; Becc. in 
Rec. Bot. Surv. Ind. ii, 201. 
€. pachystemonus (partly) Thw. Enum. Pl. Zeyl. 431. 
Description.—High scandent, very slender, Sheathed stem 5-8 mm. in diam. Leaf- 
sheaths. very slightly gibbous above, more or less armed with subulate, elongate or short, 
slender, horizontal spines or sometimes almost unarmed or only transversely rugose, 
Ocrea smooth or spinulous, at first liguliform, 5-7 mm. long, very soon withered 
and deciduous, therefore apparently short and very obliquely cut off. Leaves very 
short with very few sub-digitate or indistinctly sub-pinnate leaflets; petiole subterete 
channelled above, 7-8 cm. long, sometimes almost unarmed, usually furnished near 
the base laterally with some straight, rather strong, ascendent spines and armed 
below with a few distant irregular claws of which a few sometimes also appear on 
the very short rachis; leaflets mostly only two, sometimes 3-4, but whatever be 
their number the two of the terminal pair more or less confluent at the base 
