United States, Texas, Starr, 100-1000 ft. SE of unnamed paved road, 0.5 mi. SW of its jct. with FM 2098 in Falcon Heights, ca. 0.8 airmiles S of jct. FM 2098 and Park Rd. 4, almost E of E end of Falcon Dam. Falcon Village Quad. Lower Rio Grande Valley Nat'l Wildlife Refuge, Cuellar T
26.5525 -99.12639
Frequent in deep, undulating, calcareous, saline, clay Paleustollic Torrerts (Catarina series) over Yegua Formation (Eocene), in open thorn shrubland on rolling dissected topography. Assoc. include: (see 35 spp. listed on Herbarium sheet).