| Synonym : | Pontederia vaginalis Burm. f.
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| Bangla Name : | Nanka, Sarkachu, Nukha, Bhainsa Kachu. |
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| English Name : | - |
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| Family : | Pontederiaceae |
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| Disease : | Toothache, coughs and asthma. |
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| Description : | A slender perennial aquatic herb. Leaves 5-10 cm long, very variable, from linear to ovate or ovate-cordate, usually acuminate, petioles long, stout, terete. Inflorescence centripetal, flowers blue, in subspicate racemes. Fruit small, ellipsoid, less than 13 mm long. |
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| Distribution : | Throughout the country in swamps. |
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| Chemical Constituents : | Rootstock is rich in sugars, starch, mucilage and calcium oxalate. Leaves and leafstalks contain calcium oxalate and acrid principles (Ghani, 2003).
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| Uses : | Roots are chewed for toothache. Juice of the leaves is used for coughs and the bark eaten with sugar for asthma. |
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| Habit : | Herb |
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