Straub, S. C. K., Reveal, J. L. 2012. J. Bot. Res. Inst. Texas. 6 (2): 340.
Scheele, G. H. A. 1848. Linnaea. 21 : 461.
Type Status:
Isoneotype
Place:
Hays Co.: on top of N- to NW facing bluff of Fredericksburg Limestone ca. 40-50 feet above S bank of Blanco River, NW corner of Falls Ranch, ca. 4.5 airmiles W of jct. St. Rt. 150 and Ranch Road 2770 near Mountain City, ca. 2.8 airmiles SSE of jct. St. Rt. 150 and Ranch Road, Hays, Texas, United States, North America