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''Achillea millefolium'', commonly known as yarrow or common yarrow, is a flowering plant in the family Asteraceae. It is native to temperate regions of the Northern Hemisphere in Asia, Europe, and North America. It has been introduced as a feed for live stock in places like New Zealand〔 and Australia. However, it is a weed in those places〔 and sometimes also in its native regions. In New Mexico and southern Colorado, it is called ''plumajillo'' (Spanish for 'little feather') from its leaf shape and texture. In antiquity, yarrow was known as ''herbal militaris'', for its use in stanching the flow of blood from wounds.〔Dodson & Dunmire, 2007, ''Mountain Wildfowers of the Southern Rockies'', UNM Press, ISBN 978-0-8263-4244-7〕 Other common names for this species include gordaldo, nosebleed plant, old man's pepper, devil's nettle, sanguinary, milfoil, soldier's woundwort, thousand-leaf, and thousand-seal.〔(''Achillea millefolium'' in Flora of North America @ efloras.org ) . accessed 1.31.2013〕 ==Description== ''A. millefolium'' is an erect, herbaceous, perennial plant that produces one to several stems in height, and has a spreading rhizomatous growth form. Leaves are evenly distributed along the stem, with the leaves near the middle and bottom of the stem being the largest. The leaves have varying degrees of hairiness (pubescence). The leaves are long, bipinnate or tripinnate, almost feathery, and arranged spirally on the stems. The leaves are cauline, and more or less clasping.〔 The inflorescence has 4 to 9 phyllaries and contains ray and disk flowers which are white to pink. The generally 3 to 8 ray flowers are ovate to round. Disk flowers range from 15 to 40. The inflorescence is produced in a flat-topped capitulum cluster and the inflorescences are visited by many insects, featuring a generalized pollination system. The small achene-like fruits are called cypsela.〔 The plant has a strong, sweet scent, similar to chrysanthemums.〔 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「Achillea millefolium」の詳細全文を読む スポンサード リンク
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