United States, Texas, Brooks, In deferred pasture ca. 2.7 airmiles NW to NNW of Vargas Creek culvert on R. M. 755, 1.8 airmiles WNW of Agua Dulce Windmill, at N26o51'06.8", W098o22'00.1". Encinitos Ranch. Santa Elena SE Quadrangle.
26.85189 -98.36669
Local in sandy hardpan in unshaded dry bottom of natural pothole containing seasonal wetland, on very gently undulating landscape of South Texas Sand Sheet. Associates include Agrostis hiemalis, Aphanostephus ramosissimus, Coreopsis tinctoria, Eragrostis secundiflora, Gratiola flava, Hypericum pauciflorum, Isocoma drummondii, Lobelia berlandieri, Plantago rhodosperma, Polypremum procumbens.