芋头,是天南星科芋属的多年生草本植物。早在水稻种植前,芋头就作为“主食”出现在人们的餐桌上了,咸甜皆宜,可蒸、煮、煎和炸。现在,很多人也喜欢吃软软糯糯的蒸芋头。殊不知,网络上纷纷流传一种说法:芋头,号称植物界的“河豚”,全身都是毒!近年来,常有误食“野芋头”而引起食物中毒的案例。并非所有的“芋头”均可食用人工培育的芋头是可以食用的,但在野外,很多类似芋头的植物是不可以食用的,毒性很强。野芋头,如大野芋、野芋和海芋(又名滴水观音),这三种长相相似,且全株有毒,以茎干内的生物碱毒性最大。海老芋此外,还含有蛋白酶和皂角苷,接触后会引起皮肤瘙痒;接触眼睛可能会引起失明;误食后,嘴巴麻木流涎,喉咙刺痛肿胀,严重者会窒息,心脏麻痹,心率失常,可危及生命,一旦出现中毒症状,应立即催吐送医。那么,如何区分有毒的芋头?以“海芋”为例:看叶片芋头一般在2米以下,叶片为长圆形、心形或卵状心形,颜色较浅,呈绿中带灰;而野生海芋可长到4-5米,但海芋作为盆栽可能并不高,叶片一般呈螺旋状排列,呈阔卵形,色泽较深。芋头叶海芋叶看根茎芋头没有地上茎,块茎都被土壤包裹,呈球形、卵形或椭圆形;而海芋根茎是柱形的,有部分裸露在外(地上茎),根茎处有时可见环状的节。看地点芋头一般为人工培育,野外的通常是“野芋头”,不可食用;海芋有净化空气的功能,可作为盆栽或绿植用来观赏,多出现在园林景观中。观察洒水芋头的叶片撒上水呈颗粒状;而海芋叶片上洒水不成滴。但海芋在水分充足的情况下,叶片会有汁液滴落,也有毒性,因此叶片也不能触碰。当然,为了安全起见,最简单的办法是不要采、碰、吃野生芋头。
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