Cyperus aristatus Cyperaceae
Comments: Blue River Wildlife Management Area, Johnston County, Oklahoma. In shallow pools at base of granite boulders with Ludwigia repens, Ptilimnium nuttallii, Sabatia campestris, Isoetes butleri, Panicum dichotomofolium. 28 June 2014. 34°21'46.5" North, 96°35'47" West
(34.362930, -96.596388)
Added: 7/3/14
WARNING: Accurate determination of this plant or fungus depends on more than this single image.