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对杜仲及历年来常见的杜仲混、伪品（２７种）进行概述。并从植物来源、性状特征和显微特征上与正品进行比较，并提供鉴别真伪检索表。
The Eucommia ulmoides and the common Eucommia ulmoides mixed and fake products (27 species) are summarized. And from the plant source, traits and microscopic features on the comparison with the authentic, and to provide authenticity of the identification table.