United States, Texas, Cameron, Ca. 2.2 airmiles ESE of Jct. Southmost Rd. (FM 1419) and Indiana Ave. (FM 3068), on Southmost Ranch PReserve. Southmost Quadrangle.
Occasional in revegetation site (former cotton field) on somewhat loamy, fine-textured calcareous soil of Rio Grande delta. Associates include Argemone mexicana, A. sanguinea, Ciclospermum leptophyllum, Eragrostis cf. barrelieri, Glandularia bipinnatifida, and Lepidium sp.