All plants in this genus have laxative effects. Senna extract is used in modern pharmaceuticals such as Senakot. It has also been tested in rats as a possible treatment for diabetes.
In India young shoots and leaves of the golden senna (Senna surattensis) are eaten as a vegetable. Medicinally the flowers are used as a purgative, the bark and leaves are used to treat fungal diseases and the roots are used to alleviate gonorrhoea and treat snakebite.
In the late 18th and early 19th centuries the East India Company controlled much of the Indian subcontinent. Keen to exploit and export valuable natural commodities, the Company set out to record the flora of India and commissioned Indian artists to create detailed botanical illustrations. Many of the plants were known through their use in Ayurvedic medicine. One of the world’s oldest medicinal systems, it has been practised in India for 3,000 years.
Company School style paintings became popular with wealthy Europeans. It was not uncommon for East India Company officials (who were not employed as medics or botanists) to build their own personal collections of paintings depicting Indian flora and fauna. We cannot be sure how local amateur botanist Richard Cresswell came by this collection of 86 Company School works. It is possible Henry Creighton commissioned them during his time as a judge in Calcutta and that on his death the works came back to the UK with his granddaughter Frances who later married Richard Cresswell.