Historical records indicate that Matelea decipiens (Asclepiadaceae), oldfield milkvine or climbing milkweed, is known from Jackson, Saline, and Williamson counties in southern Illinois, where it is listed as endangered. Although a previous unvouchered occurrence has been noted in the Illinois Natural Heritage database, a recent collection from Monroe County, reported herein, officially extends the range north and west in the state.
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Vol. 78 • No. 1