364 PLANTS PROM WHICH SENNA-LEAVES ARE OBTAINED. 
found in the Tripoli Senna, and which I had already met 
with in 1828 ; but I soon convinced myself, by examining 
the fruits mixed with it, and comparing it with Darnaud's 
specimen, that it was a real senna. 
The Tripoli leaves consist, according to my examination, 
of Senna acutifolia, S. obovata, a trifling addition of S. an- 
gustifolia, and occasionally, as I found in 1828, and again 
in 1840, of the leaves of Tephrosia Apollinea, which, not 
being as constant as the adulteration of the Alexandrian 
leaves with Cynanchum Argel, I am inclined to consider as 
accidental. This plant is perfectly well figured in Delile's 
Flore (PEgypte, page 144, and described by him as Galega ; 
the delicate hairy leaves are soft, green, oblong, ovate, and, 
therefore, not easily to be distinguished from those of S. 
obovata, if this were not facilitated by the narrow, yellowish, 
hairy pods, which I found among them. I sent it at that 
time to Nees, who confirmed my views, and mentioned this 
adulteration at the meeting at Dusseldorf. 
I now come to the fifth commercial sort, viz : 
The East India senna, which I consider as identical with 
that cultivated by Mr. Hughes, in Tinevelly,near Calcutta; 
and, therefore, in consonance with Royle and Wallich, I 
admit it as Senna angustifolia, the first of whom showed it 
to me beautifully drawn as lanceolata, Forskal, in his Illus- 
trations of the Botany of the Himalaya Mountains. It appears 
that by care and cultivation, the leaves of S. angustifolia 
here become broader and longer, for this Tinevelly senna 
is exactly one-third wider and longer than the leaves of the 
same species of senna growing wild in the East Indies and 
in Arabia. The color is also deeper green, which, however, 
arises from the care taken in drying them ; for whilst the 
senna in Tinevelly is cultivated, and the leaves, like those 
of tea, gathered only when perfectly developed, the Indian 
atherer mows the wild-growing leaves (whilst yet imper- 
ectly developed, and therefore whilst narrower and 
smaller,) like hay with us, and leaves them all exposed to 
