Arum macrorrhizum Linn., Colocasia indica Kunth Enum., Alocasia indica Schott., Arum indicum Lour. (WIlld) 
|English||Alocasia, Large Taro, Roasting Coco, Elephant Ear, Giant Taro|
|Indonesia||Ababa, Bira, Birah (Sumatra); Sente, Bira (Java); Biah, Sente, Wia, Mae, Mael (Nusa Tenggara); Bira, Biha, Sente, Makata, Lawira (Sulawesi); Mira, Hila, Kei, Kiha, Tofeka, Wire, Wir (Maluku)|
|Philippines||Aba, (Ibn.); Aba-aba (Ig.), Badiang, Biga, Malabiga (Tagalog); Badiang, Bagiang, Galiang, Biga, Ragiang, Taliang (Bis.); Bira, Biga, Sininaba (Ilk); Gabi, Talipan (Bik); Bilbila (Bon.)10|
|India||Maanaka, Maana, Maankanda, Kasaalu, Hastikarni (Ayurveda); Kerukan kizhangu (Tamil)|
|Hawaii||Ape Keoke, Apii |
Alocasia macrorrhiza is a member of the Araceae family. It is a tall succulent herbaceous plant that can reach up to 4.5m. It has a large elongated stem. The leaves are huge about 0.9m long and generally arrow shaped, with shallow and rounded lobes. The leaves point upwards forming a straight line with the main axis of the petiole. They have a conspicuous mid-rib and are green in colour. The spathe has a glaucous, yellowish-green blade. The ovules are one to a few in each ovary cell in sub basal placenta. The leaves nearly peltate. The caudex well developed. 
Plant Part Used
Alomacrorrhiza A; Alocasin.
The tuber of A. macrorrhiza is used to treat influenza, high fever and malaria; diarrhoea and typhoid fever, rheumatic; pulmonary tuberculosis and tuberculous lyphadenopathy; headache; abscesses and ringworm; venomous bites of snakes, dogs and insects; leucorrhoea. It can be eaten after being put through a detoxifying process where the oxalate content is eliminated. The process of detoxifying can be apply by soaked the slice of tuber in water for 7 days with the water being changed daily. This is then dried and ready for use.  In Hawaii it is used in the treatment of severe burns, acute abdominal pains.
Rootstock – mild laxative, diuretic; used in inflammations and diseases of the abdomen and spleen. It has used in the treatment of scorpion sting amongst the Indian traditional practitioners. 
The leaf of A. macrorrhiza is traditionally used as astringent, styptic and antitumour. The root and leaf is used as rubefacient. A decoction of the leaf and stem is used in a bath for treatment of skin conditions like itching and burns. A poultice of the fresh leaves helps in improving circulation, prevent bursting and reduce pain attributed to varicose veins. The steamed oiled leaves can help relieve rheumatic pains by applied around painful joints overnight. Toated, powdered leave speed up wound healing. 
Underground stem of this plant is a common domestic remedy in gout and rheumatism. A formula called manmanda is prepared for treatment of gout, rheumatism and dropsy as follows: 3oz. of powdered rhizome, 6oz. of powdered rice, water and milk 20oz, boiled and given in dose of 1-2 oz.
ToxicitiesThe plant is considered toxic. All parts (leaves, stems and tubers) can be injurious. The toxins include raphides of water-insoluble calcium oxalate and sapotoxin (a neurological poison). Clinically the patient will experience burning sensation of the lips and mouth resulting from ingestion. Inflammatory reaction with oedema and blistering ensues. Hoarseness, dysphonia and dysphagia may result. The pain and oedema normally slowly subside without treatment. Analgesic can be given when indicated. There is no danger of systemic oxalate poisoning because Ca oxalate is insoluble.
Adverse Effects in Human:
Toxicity due to the presence of Calcium oxalate and a neurological toxin called sapotoxin. For consumption it has to be thoroughly detoxify through running water for several days.
Used in Certain Conditions
Pregnancy / Breastfeeding
The toxic effects in itself is an indication of avoidance in periods of pregnancy and lactation.
Neonates / Adolescents
Infants and children should avoid coming in contact with the plant as it will cause contact dermatitis and also gastrointestinal poisoning if consumed.
Chronic Disease Conditions
Interactions with drugs
Interactions with Other Herbs / Herbal Constituents