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1. FIRST REPORT OF HYPERICUMADPRESSUM (HYPERICACEAE) IN MICHIGAN 100-103页
作者：Michael R. Penskar； Beverly S. Walters
3. A NEW SPECIES OF HYPERICUM (HYPERICACEAE) AND SOME NEW COMBINATIONS IN THE VASCULAR FLORA OF THE CHICAGO REGION 89-96页
作者：Gerould Wilhelm； Laura Rericha
