Senna is a shrub found in India, Pakistan, South China and elsewhere. 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. The fruit is in an oblong pod about 5cm long. The leaves and pods, or fruit, are used medicinally. Its active ingredient is Sennoside
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