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''Acorus americanus'', the American Sweet Flag, is an emergent wetland plant native to the northern United States and Canada. This perennial plant has bright green blade-shaped leaves that arise directly from the rhizomes and sheath into each other at the base. Additionally the blades have 2-6 raised veins, and a swollen center when viewed in cross section. The foliage has a citrus-like spicy aromatic quality, and can be used to flavor beer. It is a flowering plant with inconspicuous flowers that are arranged on a lateral spadix (a thickened, fleshy axis) and the fertilized flowers produce berries with a jelly inside. This plant is protected as a state endangered species in Pennsylvania.〔(NRCS: USDA Plants Profile: ''Acorus americanus'' )〕 == Etymology == The name "''Acorus''" is derived from the Greek word 'acoron', a name used by Dioscorides, which in turn was derived from 'coreon', meaning 'pupil', because it was used in herbal medicine as a treatment for inflammation of the eye. The species name, "''americanus''" simply indicates that this is an American species of this genus, differentiating it from the very similar European and western Asian species Acorus calamus. == Taxonomy == ''Acorus americanus'' was formerly classified as ''Acorus calamus'' var. ''americanus''. The species name, "americanus" simply indicates that this is an American species of Acorus. It differs only in being a fertile diploid (2n = 24)], whereas most of the A. calamus of Europe and Asia is a sterile triploid species, that only spreads asexually. Diploid plants in northern Asia may be part of A. americanus.〔(Acorus americanus in Flora of North America @ efloras.org )〕Also as a diploid it does not produce b-asarone. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Acorus americanus」の詳細全文を読む スポンサード リンク
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