Cassia absus L. 

  Bu tora
Vernacular Name: Sinhala: Bu tora; Hin: Chaksu
Description: A viscid erect annual or biennial upto 45cm in height with spreading branches clothed with glandular hairs; leaves compound, rachis viscous hairy, leaflets two pairs, very oblique, elliptic-oblong or euiptic-obovate, the terminal pair the largest; flowers reddish yellow in terminal or leaf-opposed, erect, few flowered racemes, stamens five, all equal and perfect; fruits ligulate, dehiscent, compressed pods, clothed with bristly hairs, seeds 4-6, trapezoid-ovoid, black, shining.
Propagation: By seeds.
Parts Used: Leaves, seeds.
Chemical Constituents: Aloe-emodin, chrysophanol, isochrysophanol, rhein, physicion-1-glucoside, and β-sitosterol.
Uses: The leaves are bitter, astringent, acrid, thermogenic, haematinic, constipating and expectorant. They are useful in vitiated conditions of kapha, tumours, anaemia, diarrhoea, nasitis, cough, asthma and hiccough. The seeds are bitter, astringent, acrid, cooling, ophthalmic, haemostatic, diuretic, revulsive, constipating, alexeteric and vulnerary. They are useful in vitiated conditions of kappa and pitta, ophthalmopathy such as conjunctivitis, dysopia, ophthalmia, cataract, etc., epistads, haematemesis, haemorrhages, stranguiy, obesity, diarrhoea, dysentery, nephrolithiasis, poisonous bites, wounds, ulcers and bruises.