United States, Texas, Travis, At base of riverbank, N bank of Colorado River ca. 0.75 rivermiles upstream from Bastrop Co. line, under powerline at W edge of Webberville Park, ca. 1.7 airmiles SSW of jct. F. M.969 and Blake-Manor Rd. Webberville Quadrangle.
30.20889 -97.53389
Rare in moist alluvial silt and clay at base of unshaded riverbank. Associates include Echinochloa walteri, Erigeron ortegae var. spinosus, Iva annua, Juncus effusus, Panicum dichotomiflorum, Paspalum pubiflorum, P. urvillei, Persicaria punctata, Phyla nodiflora.