42 ta  ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUTTA. (C. Bonianus. 
HasrrAT,—Indo-Chína : Cambodja; the specimens in the Herbarium at Paris were 
collected by M. Gourgaud and sent to the ‘Exposition coloniale de Marseille” of 1906; 
the precise locality is not given. Native name “ Phdau Sau." 
.. OsservaTions,—It seems to approach (C. /eíradaciylus in the leaves and in the 
disposition of its leaflets, but it has a more slender and flaccid spadix with narrower, 
longer and more closely sheathing spathes. 
SouPPL. PraTE 21. Calamus cambojensis Becs. Upper end of a plant with a 
female spadix in flower. From Gourgaud’s specimen in the Herbarium at Paris. 
865, OCanawus Bontanus Bece. in Webbia di U. Martelli, iii, 231, 243 and in 
Bull. Mus. Hist. Nat. (1911), 160. 
Dzsc.rPTION.— Apparently slender, high scandent (Bon). Sheathed stem probably as 
thick as a man’s finger. Leaf-sheaths unknown, but almost certainly flagelliferous. 
Leaves (non-cirriferous) small, 48-55 cm. long (in two specimens); petiole short 
(4-6 em. long), flat on the upper surface, its margins acute and irregularly 
armed with a few, straight, horizontal spines, convex and smooth, or nearly so, 
underneath; rachis bifaced on the upper surface, more or less convex on the 
back, where irregularly armed with unequal, solitary, scattered claws, ot 
which some have a long and suddenly deflexed point; leaflets 20-27 in all, 
distinctly approximate in 6-7 groups of 2-3 on each side, with interposed 
vacant spaces 4-10 cm, long: the groups of one side opposite to those of the 
other side; the leaflets are  radiately divaricate in each group or point in 
different directions, are lanceolate or elliptical lanceolate or oblanceolate, 12-20 
em. long, 2-3 cm. broad, broadest about the middle or above, shortly and 
sometimes rather abruptly acuminate to the apex, and narrowing lower down to 
a rather acute base: are thinly papyraceous, subconcolorous, slightly paler 
underneath, have 3-5 and at times 7, very slender costae; the wmidcosta 
is sligbtly stronger than the others and sometimes sparingly spinulous on 
the upper surface, otherwise all nerves are smooth all over; transverse veinlets 
sharp and very close together; margins spreadingly  ciliate-spinulous; the two 
terminal leaflets united about half way up. Male spalit apparently elongate, 
(not seen entire) ultradecompound; secondary branchlets 7-8 em. long, with 5-7 
spikelets on each side; the spikelets recurved, arched-subscorpioid, 1-2 cm. long, their 
axes filiform, very slender; the largest spikelets (the lowest) have 15-16 flowers in all, 
which are bifarious but not flatly, so more or less point upwards; spathels 
cylindraceous and tubular in their lower part, abruptly broadening into a relatively large, 
infundibuliform limb which is strongly striately veined and produced at one side into an 
acuminate point; involuere sub-bracteiform, slightly concave, 3-lobed, the lobes acute, 
striately veined. Male flowers 3:5 mm. long, 1'5 mm. broad, narrowly ovoid- 
elliptical, acute; the calyx cupular-campanulate, rounded at the base, strongly 
striately veined, divided down to about the middle into three triangular acute lobes ; 
the corolla (in full grown flowers) a little more than twice as long as the calyx, 
its segments lanceolate, apiculate, finely striolate, Female spadiz decompound, elongate, 
1:50 m. long (in one specimen) including a slender 50 em. long, aeuleolate, termina] 
flagellum: it has a strong axillary callus at its insertion and carries eight partial 
