C. tenuis.] BECCARI. MONOGRAPH OF THE GENUS CALAMUS. 265. 
next they form continuous transverse and superficial crests or ridges; the leaflets in 
these specimens, which seem to form the transition between OC. tenuis and C. horrens , 
are furnished at the base of the mid-costa with the characteristic small spinule. 
I entertain no doubt sbout the identification of C. Royleanus Griff, with C. enuis 
Roxb., having seen authentic specimens of both. 
I have reduced also C. Heliotropium to C. tenuis, chiefly in consideration of its 
native country, though Griffith had compared it with C. leptospadiz. I have not seen 
Hamilton's Catalogue of dried plants; Martius himself seems to quote this work on 
the faith of Griffith; but Martius adds that he has seen specimens of C, Heliotropium 
sent to him by Wallich. According to Griffith, Hamilton refers to his C, Heliotropium 
the Phoenicoscorpiurus of Plukenet's Phytographia, pl. 106, f. 2, but I agree with 
Martius (l. c. p. 334) "e this figure is more like C. Rotang (L.) Roxb. than any 
other. : 
Hamilton's Catalogue, where Griffith (Palms p. x) says that 4 species of Culamus. 
are enumerated, is a manuscript work, and is not mentioned in Pritzel’s Thesaurus, 
In any case the first description known of C. Heliotropium is that published by 
Martius in vol. iii, p. 334 of his great work, and consequently if this does not 
differ from C. tenuis, this last name has the right of priority. The description of 
€. Heliotropium by Martius exactly agrees with the specimens of C. tenuis having 
young male flowers when the corolla is hardly longer than the calyx, whereas the 
fully developed male flowers have the corolla twice as long as the calyx. After all 
I do not know any Indian species of Calamus, with fully developed male flowers, 
where the Corolla is as long as the calyx. Plate cxcr of the Palms of British India, 
with the name of C. Royleanus, represents a portion of the spadix of C. tenuis with 
exaggerated pedicellate immature fruit. I also regard C. tenuis as identical with Calamus 
emarus of Loureiro, judging from some sterile specimens collected by Pierre in Cochin- 
càina and labelled with the same indigenous name as is assigned by Loureiro to 
his C. amarus, Nevertheless I do not think it proper to adopt the name of Loureiro, 
though more ancient, not having better documents to prove the identification, 
Pierres Cochin Chinese specimens of C. tenuis have the unsheathed stem 15-17 
mm. in diam.; with the surface shining and glassy of a yellowish-green colour; the 
leaflets have 3 bristly nerves in the upper surface and are undistinguishable from 
those of the more characteristic Indiam specimens, but they are without the smal! spinule 
at the base of the mid-eosta. The S-costate and not 1-costate leaflets easily distin- 
guish C. tenuis from C. Rotany. 
PraArE 94.—Calamus tenuis Zozb, Portion of a sheathed stem (on the right 
hand side) from a specimen collected by Sig. Fea in Burma (Herb. Becc.); portion 
of a stem with the bases of two leaves and of two spadices; an intermediate portion 
of a leaf (upper surface) from a specimen cultivated in the Botanic Garden at 
Buitenzorg and derived from Chittagong (in Herb. Becc.); an entire leaf with a fruit 
-spadix (of a small plant) from a specimen collected at Barisal by C. B. Clarke (in 
Herb. Becc.); a branchlet of a male spadix with detached flowers, from Falconer’s 
No. 1229 in Herb. Petr.; two female spikelets with young flowers from Chittagong, 
Ann. Roy. Bor. Garn. Catcurra Vor. XI. 
