Cassia angustifolia Vahl. The family of Leguminosae. A thermophilic small shrub up to 2 m.
It blooms from June to autumn, fruits ripen in September.

Cassia angustifolia Vahl flower

Senna is found in East Africa and the Arabian coast of the Red Sea. It is cultivated in India, as well as the republics of Central Asia.
Crude drugs are leaves, known as “alexandrian senna”, sometimes fruits. The leaves are harvested in August, October, November, and the fruit - as they mature. The harvested crude drugs are dried in the open air.
In medical practice, “alexandrian senna” is used to regulate intestinal function (chronic atonic constipation, habitual), constipation with diseases of the liver and gall bladder, as well as to soften the stool with anal fissures, sphincteritis, hemorrhoids.
It should be noted that long-term use of "alexandrian senna" drugs develops addiction to it, weakening their therapeutic effect. Therefore there is a need to alternate senna drugs with other laxative.
In Chinese medicine, “alexandrian senna” in small doses in the form of decoctions and infusions are used as a remedy of improving appetite and digestion Chinese doctors recommend drugs of senna inside edema, oligomenorrhea, glaucoma. Externally - with conjunctivitis and certain skin diseases.
Application: 8-10 grams of leaves or fruits (2 tablespoons) to infuse for 2 hours in a glass of boiling water, filter, take half a cup or a glass before meals or before going to bed.
“Alexandrian senna” is a part of a complex of licorice powder and laxative tea. Is prescribed dry extract of senna: 1-2 tablets before going to bed  or in the morning on an empty stomach.

Cassia angustifolia Vahl powder