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|Elephant foot yam|
Amorphophallus paeoniifolius, the Elephant foot yam or Whitespot giant arum  or Stink lily, is a tropical tuber crop that offers excellent scope for adoption in the tropical countries as a cash crop due to its production potential and popularity as a vegetable in various delicious cuisines.
Elephant foot yam is basically a crop of Southeast Asian origin. It grows in wild form in Sri Lanka, the Philippines, Malaysia, Indonesia, and other Southeast Asian countries. In India it is grown mostly in West Bengal, Kerala, Karnataka, Andhra Pradesh, Maharashtra and Orissa. In India it is popularly known as ol (ওল) in Bengali, suran or jimikand in Hindi, senai kizhangu in Tamil, suvarna gedde in Kannada, chena (ചേന) in Malayalam, oluo in Oriya, and pulla ganda in Telugu.
However, in Tonga, teve was seen as the most inferior of all yam species, only to be eaten if nothing else was available.
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As per Indian Medicinal Plants dictionary by C.P. Khare, published by Springer, the Elephant-foot yam has several medicinal benefits and widely used in Indian medicine including Ayuverda, Siddha and Unani. The corm is prescribed in bronchitis, asthma, abdominal pain, emesis, dysentery, enlargement of spleen, piles, elephantiasis, diseases due to vitiated blood, rheumatic swellings.
Along with other therapeutic applications, The Ayurvedic Pharmacopoeia of India indicates the use of corm in prostatic hyperplasia. (The corm is irritant due to the presence of calcium oxalate. It can be consumed after it is washed well and boiled in tamarind water or butter milk.) The corm contains an active diastatic enzyme amylase, betulinic acid, tricontane, lupeol, stigmasterol, betasitosterol and its palmitate and glucose, galactose, rhamnose and xylose.
Intake of 3.6 - 7.2 g of konjac (Amorphophallus konjac tuber) mannan for 90 days reduced the dose of insulin or hypoglycaemic drugs (in human clinical study). (Francis Brinker.) Amorphophallus sylvatius Kunth. is equated with the wild var. of Suurana, used especially in the treatment of piles.