Allium angolense Baker
Allium aobanum Araki
Cepa alba P.Renault
Cepa esculenta Gray
Family: Liliaceae - Lily family
Growth Habit: Herb
Bangla/Vernacular Name: Piyaj (Bengali).
Tribal Name: Prunsen (Bawm), Piaiynz (Chakma), Mezyn-kamseng (Khumi), Krasyan (Marma).
English Name: Onion.
An annual herb. Stem underground and modified in to small disc, generally known as bulb. Leaves radical long cylindrical, Flowers arranged in a terminal umbel inflorescence borne on a long leafless scape. Fruit a membernous, loculocidal capsule.
Principal constituent of onion is an essential oil containing various sulphur compounds such as mono-, di-, tri-, and tetra-sulphides, thiols and thiophene derivatives. Onion also contains carbohydrates, proteins, amino acids, polyphenols, quercetin, kaempferol, vitamin B and C, a saponin, ß-amyrin, sterols, phenolic acids and minerals. Besides these a large number of cyaniding glycosides have been isolated from the bulb. Prostaglandins have been detected in the bulb and leaves of onion. Dry brown outer scale contains quercetin, and other flavanoid, sterols and phenolic compounds. Scales also contain catechol and protocatechuic acid (Ghani, 2003). Diosgenin has been isolated from flowers and bulb (Rastogi & Mehrotra, 1993).
Cultivated in most of the districts of Bangladesh.
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