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Senna is a shrub found in India, Pakistan, South China and elsewhere. Its name is derived from the Arabic  word "sena," and it has been used in ayurvedic and unani medicines since the ninth century. The shrub grows  to a height of approximately two feet, with green stems and pods and yellow, scoop-shaped leaves. The alternate leaves are even-pinnate, with four or five pairs of lanceolate or obovate leaflets that are brittle  and greyish green in colour. The small yellow flowers are characterised by five spreading clawed petals.