C. Perrottetii] BEOCARI MONOGRAPH OF THE GENUS CALAMUS. 16t 
mm. broad, the uppermost shorter, the two of the terminal pair free at the base, 
Male spadiz ... . . . Female spadie apparently as in C. Leprieurii ; primary 
spathes . . . . .; partial inflorescences elongate, with many distichous spikelets on 
each side and terminating in a short, sheathed, unarmed, tail-like appendix ; secondary 
spathes elongate-infundibuliform, unarmed, finely striately veined, entire and obliquely 
truncate at the mouth and extended at one side into a broadly triangular, acute 
point; spikelets inserted just at the mouth of their respective spathes with a rather 
distinct axillary callus, rather thick, arched and recurved, the largest (the lowest in a 
portion of an inflorescence) 7 em, long, with 10 pairs of female flowers on each side 
(as it seems that each spathel subtends two equally well-formed female flowers) ;. the 
uppermost spikelets half the length of the lower ones; spathels approximate, broadly 
infundibuliform with a very narrow base, striately veined, extended at one side into a 
broadly triangular, acute or acuminate, erect, amplectent point; involucrophorum almost 
entirely immersed in its own spathel and attached at the base of the one above, sub- 
spathaceous, enveloping the neuter flower, acutely bi-carinate, bi-dentate and deeply 
emarginate on the side next to the axis; involucre deep, cupular, unilaterally evolute, 
sub-auriculiform, immersed in the involucrophorum ; areola of the neuter flower very 
conspicuous, ovate, concave, with raised and often winged borders. Female flowers 
ovate, 5 mm. long; the calyx striately veined, cleft into 3 concave, ovate, acute parts ; 
the segments of the corolla concave, acute, ovate-lanceolate, opaque, striately veined 
externally, slightly longer than the calyx. Neuter flower apparently not: differing from 
the female one, which is in the usual position. 
Hasrrar.—Senegal: at the mouth of the River Casamance. 
OssERvaTIONs.—In the year 1902 I had given the name of C. Perrottetii to a 
Calamus preserved in the Herbarium Delessert at Geneva and collected by Perrottet 
(No. 761) iu the damp forests of the west coast of tropical Africa on: the 10th of 
April 1829, near the village Sedhiou on the river Casamance in Senegal. Later I 
have received another specimen of this same species from Dr. Schweinfurth and 
collected by Leprieur in 1826, also on the river Casamance near the village of 
Montsor at Cape Rosso. This last specimen consisted of the apex of a stem 
with a portion of the leaf-sheath and an entire leaf, and of the apex of a 
partial inflorescence 20 cm. in length with 6 spikelets on each side, This is the 
specimen I have described. C. Perrottetii is extremely like C. Leprieurii, but its 
spikelets have a peculiar facies on account of the large, broadly infundibuliform, 
spathaceous spathels which embrace the flowers; the leaflets have not at their base 
the spinules so often seen in C. Leprieuríói and are more elongate than in this last. 
In C. Lepricurii the companion neuter flower at each spathel is always sterile, whilst 
in C, Perrottetii the two flowers during anthesis seem perfectly alike, but I have 
seen no spikelets after fertilisation. Nevertheless €. Perrottetii must be considered as 
a rather doubtful species, and must be compared again with C.  Leprieurüi when more 
complete materials have come to hand, 
Prate 25.—Calamus Perrottetii Bece. The entire Perrottet’s type-specimen in 
Herb. Schweinfurth. 
Ann. Roy. Bor. Garp. Catcurra Vor. XI. 
