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XII. Note on the Identity of three described Species of Acacia. 
By ChanlzEs Luss, M. D. F.L.S. 
Read April 17th, 1838. 
WHEN I was at Cairo in November last, Mr. Traill (Superintendant of the 
Gardens of Ibrahim Pasha) showed me some young plants of Roxburgh’s Mi- 
mosa Sirissa, raised from seed which I had sent from Bombay. Both Mr. Traill 
and myself were convinced of the identity of this tree, called in the Marat'ha 
language Siriis, with the Mimosa Lebbek of Forskal’s Flora LE gyptiaco- Arabica. 
Forskal does not assert that this tree is a native of Egypt,—* Kahirze hortensis 
illa" is the habitat assigned by this author. "There is, therefore, nothing to 
discourage the belief that this species was introduced into Egypt from India, 
where it is undoubtedly wild, in the drier mountain-jungles of the west. 
I feel at the same time convinced that the Mimosa speciosa of Jacquin, Misc. 
vol. iii. 47., is also identical with the above species. "The figure in that work 
precisely represents the Indian, and the Egyptian cultivated tree. I propose 
the following specific character, slightly altered from De Candolles Prodr. 
Syst. Nat., to include the three species with their synonyms. 
Acacia Lebbek: inermis, glabriuscula; pinnis plerumque 4—6-jugis : foliolis 
5—10-jugis ovalibus subdimidiatis utrinque obtusis, petiolis eglandulosis, 
capitulis pedunculatis aggregatis, floribus pedicellatis, leguminibus lato- 
linearibus planis membranaceis. 
Mimosa Lebbek. Linn. Sp. Pl. p. 1503, cum synonymis. 
Mimosa Lebbek. Forsk. Fl. Egypt.-Ar. p. cxxiii. culta in planitie (Seriscu 
Inpts !) 
Acacia Lebbek. Willd. Sp. Pl. iv. p. 1066. De Cand. Prodr. ii. p. 466. 
Mimosa Sirissa. Roxb. Flor. Ind. vol. ii. p. 544. 
Mimosa speciosa. Jacq. Misc. vol. iii. p. 47. Icon. vol. i. p. 19. t. 198. 
