Isoetes melanopoda Gay & Durieu ex Durieu Isoetaceae
Comments: Blue River Wildlife Management Area, Johnston County, Oklahoma. Seepage area along granite outcrop. In shallow pools at base of granite boulders with Ludwigia repens, Ptilimnium nuttallii, Sabatia campestris, Cyperus aristatus, Panicum dichotomofolium. Collected by permit. 28 June 2014. 34°21'46.6" North, 96°35'47.2" West (34.362938, -96.596447). Plants also at 34.36196°N, 96.59431°W.
Added: 7/8/14
WARNING: Accurate determination of this plant or fungus depends on more than this single image.