PLANTS FROM WHICH SENNA-LEAVES ARE OBTAINED. 361 
The glands of the C. ligustrina are quite different from 
those which Nees has erroneously depicted as glands in the 
C. lanceolata, in the collection at Dusseldorf, and which 
Nectoux and Persoon, who were equally mistaken, also 
declared to be glands ; for they are not glands, but only two 
hairy stipulae subulatse at the basis of either side of the 
petiole of the C. acutifolia, as in many other species of 
Cassia and Wisteria. The glands of C. ligustrina and C, 
glandulosa L., on the other hand, arise at i or k inch dis- 
tance from the bases, on the common petiole, from the hairy 
midrib, in the form of a small fungus of the size of a pin's 
head, with a yellowish stem and brown cap. 
If we now pass to the principal question, Forskal's plant 
as C. lanceolata, we find that, (taking the specimen in the 
British Milseum as the prototype,) it is identical with C. 
angustifolia, Vahl, and with Mecca and Indian senna- 
leaves, and I therefore declare it to be Senna angustifolia, 
which, as is well known, forms a part of the Alexandrian 
senna-leaves. By this, therefore, the incorrect descrip- 
tions of For skc'il, in his i( Flora JEgypto-Arabica," the less 
accurate synonym C. lanceolata, and above all, the error 
of De Candolle, respecting the glands, are got rid of; for 
C. acutifolia, Delile, cannot be confounded with it without 
further mistaking it for Senna acutifolia. It remains the 
original officinal species of Sennaar, and is distinguished by 
the more elliptic form of the slightly hairy midrib, and by 
its peculiar smell and acrid taste. I examined Dr. Kotschy's 
very perfect and beautiful specimen, sent in 1840 from 
Sennaar to the British Museum, the smooth, brownish- 
green follicles contained between the dissepiments showing 
wrinkled seeds with yellowish seed-lobes and an enamel- 
like coating. Nees, in the collection of Dusseldorf, has 
erroneously mixed this species with C. Senna and C. lan- 
ceolata, and thus only increased the confusion of the 
synonyms of these otherwise beautifully and correctly de- 
picted plants. 
31 
