United States, Texas, Presidio, Ca. 4.0 airmiles N to NNW of jct. US Rt. 67 and US Rt. 90 in downtown Marfa. East-central part of Mimms Ranch. Marfa Quadrangle.
30.36475 -104.03908
In moist silty soil along unshaded margin of pond (stock tank) in broad shallow valley on gently rolling landscape underlain by a mix of Perdiz Conglomerate (a fanglomerate of variable composition) and Quaternary alluvium. Associates included Echinochloa colona, Leptochloa fascicularis, Panicum obtusum, Xanthium strumarium.