United States, Texas, McMullen, Upper edge of Nueces River floodplain in W part of U. S. Navy's Escondido Ranch, 4.6 airmiles W to WNW of confluence of Mirasol and Ygnacio creeks, 3.8 airmiles NE of SW corner of county, at N28o05'17.0", W098o45'21.2". Piedra Creek SE Quadrangle.
28.08806 -98.75589
Locally common in seasonally moist clayey soil along broad shallow valley bottom formerly occupied by a stock tank, on gently undulating terrain underlain by Eocene strata of the Jackson Group. Associates include Dichanthium annulatum, Oenothera speciosa, Marsilea sp., Lythrum sp.