118 ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUTTA. (C. dimorphacanthus. 
Descrirrion.—The specimen upon which I have established this variety is 
remarkable for the extraordinary spinescence of the leaf-sheaths, and especially of the 
ocrea, which, moreover, is extraordinarily developed. Sheathed-stem 3 cm. in diameter. 
Leaf-sheaths densely armed with laminar, flexible, schistaceous or almost black, unequal 
spines, the largest being 20-25 mm. long. Ocrea 15 cm. long in one specimen, 
papyraceous and very rigid, very densely beset with very unequal, horizontal and 
often subseriate or confluent spines, otherwise similar to those occurring on the 
leaf-sheaths. Leaves 1°2 m. long in the pinniferous part, and terminating in a 
robust and strongly clawed cirrus; leaflets, linear, very numerous and closely set, 
equidistant, smooth underneath, and furnished above on the mid-costa and on one 
nerve on each side of it with a few, but relatively robust, subspiny bristles; the 
margins are rather closely and appressedly  spinulous; the petiole, which is 15 em. 
long, and the rachis, are both strongly armed above with unequal spines; the 
mesial leaflets are 18-20 mm. long and 8-10 mm. broad. Male spadiz about 40 cm. 
in length, narrowing gradually to a taillike tip with 7-8 tubular, gradually 
diminishing, briefly imbricate, primary spathes; male partial inflorescences short and 
dense. . 
Hasrrat.—The type specimen of this variety (a male plant; is in the Herbarium 
at Kew and was collected by A. Loher in May 1905, on the summit of Mount 
Batay at 1,980 m. elevation, in Montalban, Province of Rizal, Luzon ‘No, 7085 
Herb. Kew’. 
OxsekvaTions.--This variety differs from the type in its leaf-sheaths being very 
densely spinous, by its large, very rigid and also densely spinous ligule, and by 
its very narrow 3-nerved leaflets carrying bristles on the upper surface of all three 
nerves. In the type the ligule is membranous, brittle, and much less spinous, and 
the leaflets are bristly only on the mid-costa above, and the hairs on the margins 
are more spreading. 
SuPPL, PrarE 66.—Calamus dimorphacanthus var. montalbanicus Becc, The 
upper end of a plant with male spadices; intermediate portion of a leaf, upper surface. 
From the type specimen Loher No. 7035 in the Herbarium at Kew. 
CALAMUS DIMORPHACANTHUS var, ZAMBALENSIS Bece. in Philipp. Journ. Science, : 
iv, (1909), 632. 
DzscRIPTION.— A more robust plant than the type. Sheathed stem 4 cm. in diameter 
and perhaps at times more. Naked canes 2'5 cm. in diameter with a light straw- 
coloured, very polished surface. Leaf-sheaths very densely spinous as in the other 
forms. Ocrea not so long as in the type, densely covered with spiculae. Leaves have 
the petiole robust and short, very densely spinous; the leaflets are very numerous, 
very closely set, rigid, or papery-subcoriaceous, narrowly lanceolate: the mesials 90 
em. long or thereabouts, and 15-20 mm. broad, smooth beneath, and furnished above, 
on the mid-costa, with rigid, subspiny bristles; the side nerves are smooth; the 
margins are conspicuously ciliated with spreading spinules; the cirrus is, as is usual 
in this species, robust and armed with half-whorls of strong and tumescent claws. 
Fruiting spadiz 55 cm. long in one, specimen; primary spathes rather densely 
spinulous; partial inflorescences short, having few branches and these with few 
