United States, Texas, San Patricio, S side of tracks just W of corral at N end of McGregor Ranch/Nueces Delta Preserve, ca. 3.0-3.1 airmiles SSW of Jct. US 77 and FM 631 at Odem. Odem Quadrangle.
27.9174 -97.61535
Commom along fenceline between heavily grazed pasture on clay soils and ungrazed grassy railroad ROW on somewhat sandier soils. Associates inlcude Ambrosia psilostachya, Croton capitatus, Cynodon dactylon, Gutierrezia texana, Helianthus praecox ssp. runyonii, Indigofera suffruticosa, Lantana camara, L. urticoides, Malvaviscus arboreus, Panicum maximum, and Salvia coccinea.