Isoetes butleri Isoetaceae
Comments: Along AR 5, 0.2 miles N of intersection with Culp Road, Stone County, Arkansas. In wet, shallow soil with Clinopodium glabrum. Also open sandy areas on flat rocks. Plants we examined in this large population were all unisexual, supporting the report that I butleri is dioecious. Larger plants in deeper soil with graminoids. 30 June 2014. 36°5'44.2" North, 92°8'50.6" West (36.095603, -92.147383)
Added: 7/8/14
WARNING: Accurate determination of this plant or fungus depends on more than this single image.