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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. 牛蒡任一种杂草，主要是菊科牛蒡属的两年生植物，开粉红色或略带紫色的花穗，并被带有多刺的苞所包围，形成果实中的刺果。 http://www.iciba.com