]> GH barcode-02179831 United States of America Iowa Center Grove twp., R-36 W, T-99N, NW1/4 of NW1/4, sec 5. Entrance to Jemmerson Slough along C.R.I.& P. Ry. Co. embankment. 2 miles west of Spirit Lake Apocynum cannabinum Linnaeus Linnaeus 2021-05-26 16:10:14 E. R. Mathews