Mexico: Queretaro: Jalpan, Wolfgang Metorn s.n., March or April 1989, ZSS 97 1262 (HNT, holotype; MEXU, tsotype). Nuevo Leon: between Aramberri and Zaragoza. E of the pass between the two towns. Sierra Lampazos, 0.4 miles E of La Hoya de Eulalio, on south-facing gypsum cliffs in small canyons, 1200 m, Dec 29, 1993. Sean Hogan 5366, UCBG 94.0110 (HNT, MEXU. paratypes).