Senegalia rugata

Senegalia rugata has been used traditionally for hair care in the Indian Subcontinent since ancient times. It is one of the Ayurvedic medicinal plants. It is traditionally used as a shampoo[18] and it is also added in synthetic Ayurvedic shampoos. It is widely known as shikakai, from Tamil சிகைக்காய் cikaikkāy (cikai 'hair'+kāy 'fruit'). In order to prepare it, the fruit pods, leaves and bark of the plant are dried, ground into a powder, then made into a paste. While this traditional shampoo does not produce the normal amount of lather that a sulfate-containing shampoo would, it is considered a good cleanser. It is mild, having a naturally low pH, and does not strip hair of natural oils. An infusion of the leaves has been used in anti-dandruff preparations.[19]

Senagalia rugata extracts are used in natural shampoos or hair powders and the tree is now grown commercially in India and Far East Asia.[20] The plant parts used for the dry powder or the extract are the bark, leaves or pods. The bark contains high levels of saponins, which are foaming agents found in several other plant species used as shampoos or soaps. Saponin-containing plants have a long history of use as mild cleaning agents. Saponins from the plant's pods have been traditionally used as a detergent, and in Bengal for poisoning fish; they are documented to be potent marine toxins.

In Myanmar, the fruit is mixed with the bark of the tayaw (Grewia) tree and sometimes lime to make the traditional tayaw kinpun shampoo.[21] Shampooing with tayaw kinpun has been an important tradition in Burmese culture since ancient times. Burmese kings used to wash their hair with tayaw kinpun during the royal hair-washing ceremony (ခေါင်းဆေး မင်္ဂလာပွဲ), in the belief that using the shampoo would cast away bad luck and bring good luck.[22] It remains customary for many Burmese people to wash their heads with tayaw kinpun, especially on the Burmese New Year's Day to leave behind impurities and bad omens of the past,[23][24] and the shampoo is commonly sold in the country's open-air markets, typically in plastic bags.[25][26]

This species is used in a variety of ways in Cambodia.[16] The young leaves are included in salads. The fruit is used for washing hair and in local medicine. To treat abscesses, eczema and leprosy the fruit can also be used externally or as a laxative when they are taken internally. The pulp of the fruit, without the seeds, is used as a diuretic and emetic, while the seeds are reputed to make delivery in childbirth easier.

Traditional healers of Nakhon Nayok Province, Thailand, use the leaves of this species to treat irregular menstruation.[17]

Amongst the Karen people of Chiang Mai Province, Thailand, the plant is one of the most widely used legumes.[9] They use the fruit in a cold infusion both as soap and shampoo, and as a medicine for food poisoning. The dried fruit is used in holy water for the rituals to pay respect to elderly people and to evict wickedness.

Investigating plant use amongst both Karen and Lawa people living in Pang Hin Fon district (Chiang Mai), S. rugata was one of the plants that provided both food and health-products.[15] The young shoots and leaves are cooked in a soup, the fruit are eaten raw or cooked, while the bark was chewed and kept as a quid in the mouth to counter-act toothache, and a decoction of the fruit was used as shampoo.

An infusion of the leaves of Senagalia rugata has also been used for therapy of jaundice in the traditional Indian medicine.[27]

In Nepal, the plant is one of many that are processed and sold in the medicinal products industry.[28] In 2004, an estimated 2,459 kilograms (5,421 lb) of material was purchased nationwide by the industry at an average price of 80 Nepalese rupees. Central wholesalers provided the raw material.

Flowers

The leaves have an acidic taste and are used in chutneys.