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Arctium in the composite family, having pink or purplish flower heads surrounded by prickly bracts and forming a bur in fruit. 牛蒡任一種襍草，主要是菊科牛蒡屬的兩年生植物，開粉紅色或略帶紫色的花穗，竝被帶有多刺的苞所包圍，形成果實中的刺果。 http://www.iciba.com