**13.5.** *Senna alata* **(L.) Roxb**

*S. alata* grows in several regions of Africa and in other parts of the world [71]. The leaves and stem bark of *S. alata* are widely used to treat hepatitis, skin diseases, jaundice, gastroenteritis, intestinal helminthiasis, eczema, tryphoenteritis and ringworm. The leaves of the plant have been shown to possess antibacterial activity on both Gram positive and negative bacteria, for example, *Bacillus megaterium, Streptococcus haemolyticus, Staphylococcus aureus, Salmonella typhi, Pseudomonas aeruginosa and Klebsiella pneumoniae* [71].
